| Ad Hoc On Demand Distance Vector (AODV) | 
| AODV Message Types | RFC 3561 | 
| Extension Type | RFC 3561 | 
| Address Family Numbers | 
| Address Family Numbers | RFC 4822, RFC 4760 | 
| Address Resolution Protocol (ARP) Parameters | 
| Hardware Types | RFC 826, RFC 5494 | 
| Operation Codes | RFC 826, RFC 5494 | 
| Protocol Type | RFC 826, RFC 5342, RFC 5494 | 
| Applicable Exchange Core (APEX) Parameters | 
| APEX Endpoint Applications | RFC 3340 | 
| APEX Options | RFC 3340 | 
| APEX Services | RFC 3340 | 
| Application Access Protocol (ACAP) Parameters | 
| ACAP Capabilities | RFC 2244 | 
| ACAP Response Codes | RFC 2244 | 
| Dataset Classes | RFC 2244 | 
| Vendor Subtrees | RFC 2244, RFC 6075 | 
| Authenticated Encryption with Associated Data (AEAD) Parameters | 
| AEAD Algorithms | RFC 5116 | 
| Authentication and Key Agreement (AKA) | 
| Version Namespace | RFC 3310 | 
| Authentication Option Name Spaces | 
| Look under Dynamic Host Configuration Protocol (DHCP) |  | 
| Authentication, Authorization, and Accounting (AAA) Parameters | 
| Application IDs | RFC 3588 | 
| AVP Codes | RFC 3588 | 
| AVP Flags Value | RFC 3588 | 
| AVP Specific Values | RFC 3588 | 
| Command Codes | RFC 3588, RFC 5719, RFC 5729 | 
| Command Flags | RFC 3588 | 
| Mobility Capability Registry | RFC 5447 | 
| QoS Profile | RFC 5624 | 
| Author Domain Signing Practices (ADSP) Parameters | 
| ADSP Outbound Signing Practices | RFC 5617 | 
| ADSP Specification Tags | RFC 5617 | 
| Automatic Responses to Electronic Mail Parameters | 
| Auto-Submitted header field keywords | RFC 5436 | 
| Auto-Submitted header field optional parameters | RFC 3834 | 
| Autonomous System (AS) Numbers | 
| 16-bit Autonomous System Numbers | RFC 1930, RFC 5398 | 
| 32-bit Autonomous System Numbers | RFC 4893, RFC 5398 | 
| Bidirectional Forwarding Detection (BFD) Parameters | 
| BFD Authentication Types | RFC 5880 | 
| BFD Diagnostic Codes | RFC 5880 | 
| Binary Floor Control Protocol (BFCP) Parameters | 
| Attribute Subregistry | RFC 4582 | 
| Error Code Subregistry | RFC 4582 | 
| Primitive Subregistry | RFC 4582 | 
| Request Status Subregistry | RFC 4582 | 
| Blocks Extensible Exchange Protocol (BEEP) Parameters | 
| BEEP Features | RFC 3080 | 
| BEEP Profiles | RFC 3080 | 
| Border Gateway Protocol (BGP) Parameters | 
| BGP Cease NOTIFICATION message subcodes | RFC 4486 | 
| BGP Data Collection Standard Communities | RFC 4384 | 
| BGP Error Codes | RFC 4271 | 
| BGP Error Subcodes | RFC 4271 | 
| BGP Extended Communities Types | RFC 4360 | 
| BGP Message Types | RFC 4271 | 
| BGP OPEN Optional Parameter Types | RFC 5492 | 
| BGP Outbound Route Filtering (ORF) Types | RFC 5291 | 
| BGP Path Attributes | RFC 4271 | 
| BGP Tunnel Encapsulation Attribute Sub-TLVs | RFC 5512 | 
| BGP Tunnel Encapsulation Attribute Tunnel Types | RFC 5512 | 
| Capability Codes | RFC 5492 | 
| Four-octet AS Specific Extended Community | RFC 5668 | 
| IPv4 Address Specific Extended Community | RFC 4360 | 
| IPv6 Address Specific Extended Community | RFC 5701 | 
| Opaque Extended Community | RFC 4360 | 
| Traffic Action Fields | Internet Draft draft-ietf-idr-flow-spec-09 | 
| Two-octet AS Specific Extended Community | RFC 4360 | 
| Well-known Communities | RFC 1997 | 
| Building Blocks | 
| Building Blocks | RFC 3048 | 
| Caller-ID Numbering Plans | 
| Tokens | RFC 3939 | 
| Candidate Access Router Discovery (CARD) Parameters | 
| SEAMOBY AVP Type Registry | RFC 4065 | 
| SEAMOBY Experimental Mobility Protocol Subtype Registry | RFC 4065 | 
| SEAMOBY Layer 2 Access Technology Identifier Registry | RFC 4065 | 
| CERT RR Certificate Types | 
| Certificate Types | RFC 4398 | 
| Channel Binding Types | 
| Channel Binding Types | RFC 5056 | 
| Character Sets | 
| Character Sets | RFC 2978 | 
| Mailing List Information | RFC 2978 | 
| Registration Templates | RFC 2978 | 
| Common Architecture Label IPv6 Security Option (CALIPSO) | 
| CALIPSO Domain of Interpretation (DOI) | RFC 5570 | 
| Common Name Resolution Protocol (CNRP) Parameters | 
| Properties, Property Types, and Status Messages | RFC 3367 | 
| Common Open Policy Service (COPS) Protocol Parameters | 
| A-Types and Sub-Types | RFC 3182 | 
| ADMISSION_PRI (P-Type 0x05) Error Codes | Internet Draft draft-ietf-tsvwg-emergency-rsvp-15 | 
| Auth_Session X-Types and Sub-Types | RFC 3520 | 
| C-Num and C-Type Values | RFC 2748 | 
| Client Types Values | RFC 2748 | 
| Error sub-codes defined for messages containing Client-type = 0 | RFC 4261 | 
| Error Values | RFC 3182 | 
| M-Types, Reason Sub-Codes, and Error Sub-Codes | RFC 2748 | 
| Merge Strategies | Internet Draft draft-ietf-tsvwg-emergency-rsvp-15 | 
| P-Type | RFC 2750 | 
| R-Types, Reason-Codes, Report-Types, Decision Object Command-Codes/Flags, and Error Codes | RFC 2748 | 
| Receiver Proxy Control Policy Element (P-Type 0x07) Control-Value field | Internet Draft draft-ietf-tsvwg-rsvp-proxy-proto-11 | 
| S-Num, S-Types, and Error-Codes | RFC 3084 | 
| X-Types and Sub Types | RFC 3520 | 
| Common Presence and Instant Messaging (CPIM) | 
| CPIM Headers | RFC 3862 | 
| Context Labels for Internet Messages | 
| Internet Messages Content Types | RFC 3458 | 
| Context Transfer Protocol (CXTP) Parameters | 
| SEAMOBY Context Transfer Profile Type Registry | RFC 4065 | 
| SEAMOBY Context Transfer Protocol Authorization Token Calculation Algorithms | RFC 4065 | 
| Control And Provisioning of Wireless Access Points (CAPWAP) Parameters | 
| AC DTLS Policy | RFC 5415 | 
| AC Information Type
 | RFC 5415 | 
| AC Security Types | RFC 5415 | 
| CAPWAP Control Message Flags | RFC 5415 | 
| CAPWAP Header Flags | RFC 5415 | 
| CAPWAP IEEE 802.11 Message Types | RFC 5416 | 
| CAPWAP Message Element Type | RFC 5415 | 
| CAPWAP Message Types | RFC 5415 | 
| CAPWAP Transport Protocol Types | RFC 5415 | 
| CAPWAP Wireless Binding Identifier | RFC 5415 | 
| Data Transfer Mode | RFC 5415 | 
| Data Transfer Type | RFC 5415 | 
| Discovery Types | RFC 5415 | 
| ECN Support | RFC 5415 | 
| IEEE 802.11 Antenna Combiner | RFC 5416 | 
| IEEE 802.11 Antenna Selection | RFC 5416 | 
| IEEE 802.11 Auth Type | RFC 5416 | 
| IEEE 802.11 Encryption Capabilities | RFC 5416 | 
| IEEE 802.11 Key Status | RFC 5416 | 
| IEEE 802.11 QoS | RFC 5416 | 
| IEEE 802.11 Session Key Flags | RFC 5416 | 
| IEEE 802.11 Tagging Policy | RFC 5416 | 
| IEEE 802.11 WTP Radio Fail | RFC 5416 | 
| IEEE 802.11 WTP Radio Type | RFC 5416 | 
| Radio Admin State | RFC 5415 | 
| Radio Failure Causes | RFC 5415 | 
| Radio Operational State | RFC 5415 | 
| Result Code | RFC 5415 | 
| Returned Message Element Reason | RFC 5415 | 
| WTP Board Data Type | RFC 5415 | 
| WTP Descriptor Type | RFC 5415 | 
| WTP Fallback Mode | RFC 5415 | 
| WTP Frame Tunnel Mode | RFC 5415 | 
| WTP MAC Type | RFC 5415 | 
| WTP Radio Stats Failure Type | RFC 5415 | 
| WTP Reboot Stats Failure Type | RFC 5415 | 
| Cryptographic Suites for IKEv1, IKEv2, and IPsec | 
| Identifiers | RFC 4308 | 
| Cryptographically Generated Addresses (CGA) Name Space | 
| CGA Extension Type Values | RFC 4581 | 
| CGA SEC | RFC 4982 | 
| CGA Type Tags | RFC 3972 | 
| Data Link Switching Client Access Protocol (DCAP) Parameters | 
| Data Link Switching Protocol Frame Codes | RFC 2114 | 
| Data Link Switching Protocol Sender Capability Codes | RFC 2114 | 
| Data Structure for the Security Suitability of Cryptographic Algorithms (DSSC) | 
| Cryptographic Algorithms | RFC 5698 | 
| Parameter Definitions | RFC 5698 | 
| Datagram Congestion Control Protocol (DCCP) Parameters | 
| Ack Vector States | RFC 4340 | 
| Congestion Control Identifiers | RFC 4340 | 
| Drop Codes | RFC 4340 | 
| Feature Numbers | RFC 4340 | 
| Option Types | RFC 4340 | 
| Packet Types | RFC 4340 | 
| Port Numbers | RFC 4340 | 
| Profile for DCCP Congestion Control ID 2: TCP-like Congestion Control Parameters - Feature Numbers | RFC 4341 | 
| Profile for DCCP Congestion Control ID 2: TCP-like Congestion Control Parameters - Option Types | RFC 4341 | 
| Profile for DCCP Congestion Control ID 2: TCP-like Congestion Control Parameters - Reset Codes | RFC 4341 | 
| Profile for DCCP Congestion Control ID 3: TFRC Congestion Control Parameters - Feature Numbers | RFC 4342 | 
| Profile for DCCP Congestion Control ID 3: TFRC Congestion Control Parameters - Option Types | RFC 4342 | 
| Profile for DCCP Congestion Control ID 3: TFRC Congestion Control Parameters - Reset Codes | RFC 4342 | 
| Reset Codes | RFC 4340 | 
| Service Codes | RFC 4340 | 
| Datagram Transport Layer Security (DTLS) Extension to Establish Keys for Secure Real-time Transport Protocol (SRTP) | 
| DTLS-SRTP Protection Profiles | RFC 5764 | 
| Delegation Signer Resource Record | 
| Digest Algorithms | RFC 3658, RFC 4034, RFC 4035 | 
| Delivery Status Notification (DSN) Types | 
| address-types, diagnostic-types, MTA-name-types | RFC 3464 | 
| Diameter | 
| AAA Parameters | RFC 3588 | 
| Differentiated Services Field Codepoints (DSCP) | 
| DSCP Pools | RFC 2474 | 
| Directory System Names | 
| Distinguished Names | RFC 4520 | 
| DNSSEC NSEC3 Parameters | 
| DNSSEC NSEC3 Flags | RFC 5155 | 
| DNSSEC NSEC3 Hash Algorithms | RFC 5155 | 
| DNSSEC NSEC3PARAM Flags | RFC 5155 | 
| Domain Name System (DNS) Key Resource Record Protocol Octet | 
| DNS Key Resource Record Protocol Octet Values | RFC 2535 | 
| Domain Name System (DNS) Parameters | 
| AFSDB RR Subtype | [Internet Draft draft-ietf-dnsext-5395bis-03][RFC 1035] | 
| DHCID RR type codes | RFC 4701 | 
| DNS CLASSes | Internet Draft draft-ietf-dnsext-5395bis-03 | 
| DNS EDNS0 Options | RFC 2671 | 
| DNS Header Flags | Internet Draft draft-ietf-dnsext-5395bis-03, RFC 1035 | 
| DNS Label Types | RFC 2671 | 
| DNS OpCodes | Internet Draft draft-ietf-dnsext-5395bis-03, RFC 1035 | 
| DNS RCODEs | Internet Draft draft-ietf-dnsext-5395bis-03 and RFC 1035 | 
| DNSKEY RR Flags | RFC 3755 | 
| EDNS Header Flags | RFC 2671 | 
| Resource Record (RR) TYPEs | Internet Draft draft-ietf-dnsext-5395bis-03 and RFC 1035 | 
| SSHFP RR types for fingerprint types | RFC 4255 | 
| SSHFP RR Types for public key algorithms | RFC 4255 | 
| Domain Name System (DNS) Security Algorithm Numbers | 
| DNS KEY Record Diffie-Hellman Prime Lengths | RFC 2539 | 
| DNS KEY Record Diffie-Hellman Well-Known Prime/Generator Pairs | RFC 2539 | 
| DNS Security (DNSSEC) Algorithm Numbers | RFC 3755, RFC 4034, Internet Draft draft-ietf-dnsext-dnssec-alg-allocation-03 | 
| DomainKeys Identified Mail (DKIM) Parameters | 
| Domainkey DNS TXT Record Tag Specifications | RFC 4871 | 
| DKIM Hash Algorithms | RFC 4871 | 
| DKIM Key Type | RFC 4871 | 
| DKIM Selector Flags | RFC 4871 | 
| DKIM Service Types | RFC 4871 | 
| DKIM Signature Tag Specifications | RFC 4871 | 
| DKIM-Signature Canonicalization | RFC 4871 | 
| DKIM-Signature Query Method | RFC 4871 | 
| Dynamic Host Configuration Protocol (DHCP) | 
| Algorithm Name Space Values | RFC 3118 | 
| Protocol Name Space Values | RFC 3118 | 
| RDM Name Space Values | RFC 3118 | 
| Dynamic Host Configuration Protocol (DHCP) and Bootstrap Protocol (BOOTP) | 
| Authentication Suboption (value 8) number-spaces - Algorithm identifier values | RFC 4030 | 
| Authentication Suboption (value 8) number-spaces - RDM Algorithm identifier values | RFC 4030 | 
| BOOTP Vendor Extensions and DHCP Options | RFC 2939 | 
| CableLabs Client Configuration Option Ticket Control Mask Bit Definitions | RFC 3594 | 
| DHCP Agent Sub-Option Codes | RFC 3046 | 
| DHCP Cablelabs Client Configuration Option Type 122 Sub-Option Codes | RFC 3495 | 
| DHCP Message Type 53 Values | RFC 2939 | 
| GeoConf Option fields - The Altitude (AT) Field | RFC 3825 | 
| GeoConf Option fields - The Datum field | RFC 3825 | 
| IEEE 802.21 Service Type (MoS DHCPv4 Address and FQDN Sub-Options) | RFC 5678 | 
| NetWare/IP Option Type 63 Sub-Option Codes | RFC 2242 | 
| NTP Time Source Suboptions | Internet Draft draft-ietf-ntp-dhcpv6-ntp-opt-06 | 
| Dynamic Host Configuration Protocol for IPv6 (DHCPv6) | 
| DHCPv6 Mobile IPv6 Sub-option Codes | Internet Draft draft-ietf-mip6-hiopt-17 | 
| DUIDs | RFC 3315 | 
| Dynamic Host Configuration Protocol (DHCP) Message Types | RFC 3315 | 
| Dynamic Host Configuration Protocol (DHCP) Options | RFC 3315 | 
| Home Network Information Option Id-type Codes | Internet Draft draft-ietf-mip6-hiopt-17 | 
| IEEE 802.21 Service Type (MoS DHCPv6 Address and FQDN Sub-Options) | RFC 5678 | 
| OPTION_LQ_QUERY option | RFC 5007 | 
| Processor Architecture Types | RFC 5970 | 
| Status Codes | RFC 3315 | 
| Dynamic Source Routing Protocol (DSR) | 
| DSR Protocol Options | RFC 4728 | 
| DSR Protocol Route Error Types | RFC 4728 | 
| Dynamic Symmetric Key Provisioning Protocol (DSKPP) | 
| DSKPP Version Registry | RFC 6063 | 
| Key Container Registry | RFC 6063 | 
| PRF Algorithm ID Registry | RFC 6063 | 
| Status Codes | RFC 6063 | 
| EAP-pwd Parameters | 
| Password Preprocessing Methods | RFC 5931 | 
| PRF Registry | RFC 5931 | 
| PWD-Exch Messages | RFC 5931 | 
| Random Function Registry | RFC 5931 | 
| Electronic Commerce Language (ECML) | 
| Parameter Values | RFC 4112 | 
| Electronic Commerce Language Version 2 (ECMLv2) | 
| Ecom_Payment_Card_Protocol Registry | RFC 4112 | 
| Ecom_Payment_Card_Type Registry | RFC 4112 | 
| Ecom_Transaction_Type Registry | RFC 4112 | 
| Email Authentication Parameters | 
| Email Authentication Methods | RFC 5451 | 
| Email Authentication Result Names | RFC 5451 | 
| Enterprise Numbers | 
| Enterprise Numbers | RFC 2578 | 
| ENUM - Telephone Number Mapping | 
| Enumservice Registrations | Internet Draft draft-ietf-enum-enumservices-guide-22 | 
| Ethernet Numbers | 
| Ethernet Numbers | RFC 5342 | 
| Extended Master Session Key (EMSK) Parameters | 
| EMSK PRF Numbers | RFC 5295 | 
| User Specific Root Keys (USRK) Key Labels | RFC 5295 | 
| Extensible Provisioning Protocol (EPP) | 
| EPP Repository IDs | RFC 3730 | 
| Extensible Authentication Protocol (EAP) | 
| EAP EXT_Type Numbers | RFC 4764 | 
| EAP Initiate and Finish Attributes | RFC 5296 | 
| EAP-AKA and EAP-SIM Parameters | RFC 4187 | 
| EAP-AKA' AT_KDF Key Derivation Function values | RFC 5448 | 
| EAP-FAST Error-TLV Error-Codes | RFC 4851 | 
| EAP-FAST GTC Error Codes | RFC 5421 | 
| EAP-FAST PAC Attribute Types | RFC 5422 | 
| EAP-FAST PAC Types | RFC 5422 | 
| EAP-FAST Request-Action TLV Action Codes | RFC 4851 | 
| EAP-FAST Server-Trusted-Root Credential Format Types | RFC 5422 | 
| EAP-FAST TLV Types | RFC 4851 | 
| EAP-GPSK Ciphersuites | RFC 5433 | 
| EAP-GPSK Failure Codes | RFC 5433 | 
| EAP-GPSK OP Codes | RFC 5433 | 
| EAP-GPSK Protected Data Payloads | RFC 5433 | 
| EAP-IKEv2 Payloads | RFC 5106 | 
| EAP-PAX ADE Type Namespace | RFC 4746 | 
| EAP-PAX DH Group ID Namespace | RFC 4746 | 
| EAP-PAX MAC ID Namespace | RFC 4746 | 
| EAP-PAX Public Key ID Namespace | RFC 4746 | 
| EAP-POTP Cryptographic Algorithm Identifiers | RFC 4793 | 
| EAP-SAKE messages | RFC 4763 | 
| EAP-SAKE non-skippable attributes | RFC 4763 | 
| EAP-SAKE skippable attributes | RFC 4763 | 
| EAP-TTLS AVP Usage | RFC 5281 | 
| Message Types | RFC 5296 | 
| Method Types | RFC 3748 | 
| Packet Codes | RFC 3748 | 
| Re-authentication Cryptosuites | RFC 5296 | 
| Extensible Authentication Protocol Encrypted Key Exchange (EAP-EKE) Registry | 
| EAP-EKE Channel Binding Type Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Diffie-Hellman Group Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Encryption Algorithm Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Exchange Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Failure-Code Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Identity Type Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Keyed Message Digest (MAC) Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| EAP-EKE Pseudo Random Function Registry | Internet Draft draft-sheffer-emu-eap-eke-09 | 
| Fibre Channel (FC) | 
| Port Types | RFC 4044 | 
| Flow Spec Parameters | 
| Flow Spec Component Types | RFC 5575 | 
| Foobar AF Numbers | 
| Foobar AF Numbers | RFC 1639 | 
| Forwarding and Control Element Separation (ForCES) Parameters | 
| Association Setup Response | RFC 5810 | 
| Association Teardown Message | RFC 5810 | 
| Header Flags | RFC 5810 | 
| Logical Functional Block (LFB) Class Names and Class Identifiers | RFC 5812 | 
| Message Types | RFC 5810 | 
| Operation Selection (OPER-TLV) Types | RFC 5810 | 
| RESULT-TLV Result Values | RFC 5810 | 
| TLV Types | RFC 5810 | 
| FTP parameters | 
| FTP Commands and Extensions | RFC 5797 | 
| OS specific FTP parameters | RFC 3659 | 
| General Internet Signalling Transport (GIST) Parameters | 
| Additional Information Types | RFC 5971 | 
| Error Code 1 Subcodes | RFC 5971 | 
| Error Code 10 Subcodes | RFC 5971 | 
| Error Code 12 Subcodes | RFC 5971 | 
| Error Code 9 Subcodes | RFC 5971 | 
| GIST Error Codes | RFC 5971 | 
| GIST MA-Protocol-IDs | RFC 5971 | 
| GIST Message Routing Methods | RFC 5971 | 
| GIST Message Types | RFC 5971 | 
| GIST Object Types | RFC 5971 | 
| NSIS Signaling Layer Protocol (NSLP) Identifiers | RFC 5971 | 
| Generalized Multi-Protocol Label Switching (GMPLS) Signaling Parameters | 
| Actions | RFC 3471 | 
| Administrative Status Information Flags | RFC 4783 | 
| Association Type | RFC 4872 | 
| CWDM Channel Spacing Subregistry | Internet Draft draft-ietf-ccamp-gmpls-g-694-lambda-labels-11 | 
| DWDM Channel Spacing Subregistry | Internet Draft draft-ietf-ccamp-gmpls-g-694-lambda-labels-11 | 
| Ethernet Bandwidth Profiles | RFC 6003 | 
| Ethernet Sender TSpec TLVs/Ethernet Flowspec TLVs | RFC 6003 | 
| Ethernet Switching Granularities | RFC 6003 | 
| Generalized PID (G-PID) | RFC 3471 | 
| Grid Subregistry | Internet Draft draft-ietf-ccamp-gmpls-g-694-lambda-labels-11 | 
| Hierarchy Actions | [RFC 6107] | 
| Interface_ID Types | RFC 3471 | 
| LSP Encoding Types | RFC 3471 | 
| Switching Types | RFC 3471 | 
| Generic Routing Encapsulation (GRE) Parameters | 
| GRE Protocol Types | RFC 2784 | 
| GRE Version Numbers | RFC 2784 | 
| Generic Security Service Application Program Interface (GSSAPI) Service Names | 
| GSSAPI/Kerberos/SASL Service Names | RFC 2743 | 
| Geopriv HTTP Enabled Location Delivery (HELD) Parameters | 
| HELD Error Codes | RFC 5985 | 
| Geopriv Location Object Registries | 
| Method Tokens associated with the PIDF-LO Object | RFC 4119 | 
| PIDF-LO Civic Address Considerations Registry | RFC 5774 | 
| XML Namespaces for 'provided-by' elements for use with PIDF-LO objects | RFC 4119 | 
| Geopriv Location Type Registries | 
| CAtypes | RFC 4776 | 
| Location Type Registry | RFC 4589 | 
| Global Switch Management Protocol version 3 (GSMPv3) Parameters | 
| GSMPv3 Adaptation Type Name Space | RFC 3292 | 
| GSMPv3 Event Flag Type Name Space | RFC 3292 | 
| GSMPv3 Failure Response Message Name Space | RFC 3292 | 
| GSMPv3 Label Type Name Space | RFC 3292 | 
| GSMPv3 Message Type Name Space | RFC 3292 | 
| GSMPv3 Model Type Name Space | RFC 3292 | 
| GSMPv3 Port Type Name Space | RFC 3292 | 
| GSMPv3 Result Type Name Space | RFC 3292 | 
| GSMPv3 Service ID Type Name Space | RFC 3292 | 
| GSMPv3 Traffic Control Type Name Space | RFC 3292 | 
| Global Switched Telephone Network (GSTN) Extensions | 
| Qual2-Label | RFC 2846 | 
| Qualif-Type 1 | RFC 2846, RFC 3191 | 
| Service Selector | RFC 2846, RFC 3191 | 
| Group Domain of Interpretation (GDOI) | 
| Payload Type Values | RFC 3547 | 
| Hash Function Textual Names | 
| Hash Function Names | RFC 4572 | 
| Host Identity Protocol (HIP) Parameters | 
| DI-Types | RFC 5201 | 
| Group IDs | RFC 5201 | 
| HIP Version | RFC 5201 | 
| HIP Via Flags | RFC 6028 | 
| Notify Message Types | RFC 5201 | 
| Packet Types | RFC 5201 | 
| Parameter Types | RFC 5201 | 
| Registration Failure Types | RFC 5203 | 
| Registration Types | RFC 5203 | 
| Suite IDs | RFC 5201 | 
| Hypertext Transfer Protocol (HTTP) Digest Algorithm Values | 
| HTTP Digest Algorithm Values | RFC 3230 | 
| Hypertext Transfer Protocol (HTTP) Parameters | 
| Content-Coding Values | RFC 2616 | 
| Transfer-Coding Values | RFC 2616 | 
| Hypertext Transfer Protocol (HTTP) Status Codes | 
| HTTP Status Codes | RFC 2817 | 
| Hypertext Transfer Protocol (HTTP) Upgrade Tokens | 
| HTTP Upgrade Tokens | RFC 2817 | 
| IANA Maintained MIBs | 
| IANA Address Family Numbers MIB | 
 | 
| IANA Charset MIB | RFC 3808 | 
| IANA Finisher MIB | RFC 3806 | 
| IANA GMPLS TC MIB | RFC 4802 | 
| IANA ifTypes MIB | RFC 2863 | 
| IANA IP Route Protocol MIB | RFC 2932 | 
| IANA IPFIX SELECTOR MIB | Internet Draft draft-ietf-ipfix-mib-09 | 
| IANA IPPM Metrics Registry MIB | RFC 4148 | 
| IANA ITU Alarm TC MIB | RFC 3877 | 
| IANA Language MIB Definitions | RFC 3165 | 
| IANA MALLOC MIB | RFC 3559 | 
| IANA MAU MIB | RFC 4836 | 
| IANA Printer MIB | RFC 3805 | 
| IANA Tn3270eTC MIB | RFC 2561 | 
| iCalendar Elements | 
| Actions | RFC 5545 | 
| Calendar User Types | RFC 5545 | 
| Classifications | RFC 5545 | 
| Components | RFC 5545 | 
| Free/Busy Time Types | RFC 5545 | 
| Methods | RFC 5545 | 
| Parameters | RFC 5545 | 
| Participation Roles | RFC 5545 | 
| Participation Statuses | RFC 5545 | 
| Properties | RFC 5545 | 
| Relationship Types | RFC 5545 | 
| REQUEST-STATUS Values | RFC 5546 | 
| Value Data Types | RFC 5545 | 
| IEEE 802 Numbers | 
| IEEE 802 Numbers | Assigned by the IEEE Registration Authority
 | 
| IETF Protocol Parameter Identifiers | 
| IETF URN Sub-namespace for Registered Protocol Parameters | RFC 3553 | 
| IMAP Keywords | 
| IMAP Keywords |  | 
| Instance Manipulation Values | 
| Instance Manipulation Values | RFC 3229 | 
| Instant Message Disposition Notification (IMDN) Headers | 
| IMDN Headers | RFC 5438 | 
| Instant Messaging SRV Protocol | 
| Label Registry |  | 
| Integrated Service Parameters | 
| Compression Hints | RFC 3006 | 
| Parameter Names | RFC 2216 | 
| Service Names | RFC 2216 | 
| Inter-Asterisk eXchange (IAX) Parameters | 
| IAX Authentication Methods | RFC 5457 | 
| IAX Calling Presentation | RFC 5457 | 
| IAX Calling Type of Number | RFC 5457 | 
| IAX Cause Codes | RFC 5457 | 
| IAX Control Frame Subclass | RFC 5457 | 
| IAX Control Frames | RFC 5457 | 
| IAX Dialplan Status Flags | RFC 5457 | 
| IAX Encryption Methods | RFC 5457 | 
| IAX Frame Types | RFC 5457 | 
| IAX HTML Command Subclasses | RFC 5457 | 
| IAX Information Elements | RFC 5457 | 
| IAX Media Formats | RFC 5457 | 
| IAX Meta Commands | RFC 5457 | 
| IAX Type of Network | RFC 5457 | 
| Internationalized Domain Names (IDN) | 
| IANA Repository of TLD IDN Practices | RFC 3743 | 
| Internationalized Domain Names in Applications (IDNA) Parameters | 
| IDNA Contextual Rules | RFC 5892 | 
| IDNA Derived Properties | RFC 5892 | 
| Internet Application Protocol | 
| Collation Registry | RFC 4790 | 
| Internet Control Message Protocol (ICMP) Parameters | 
| Code Fields | RFC 2939 | 
| ICMP Extension Object Classes | RFC 4950 | 
| ICMP Type Numbers | RFC 2939 | 
| Internet Control Message Protocol version 6 (ICMPv6) Parameters | 
| "Code" Fields | RFC 4443 | 
| Certificate Option (Type 16) Cert Type field | RFC 3971 | 
| FMIPv6 Message Types | RFC 5568 | 
| IPv6 Neighbor Discovery Option Formats | RFC 4861 | 
| IPv6 Type Numbers | RFC 4443 | 
| Qtypes | RFC 4620 | 
| Trust Anchor Option (Type 15) Name Type field | RFC 3971, Internet Draft draft-ietf-csi-send-name-type-registry-06 | 
| Internet Group Management Protocol (IGMP) Type Numbers | 
| "Code" Fields | RFC 3228 | 
| IGMP Type Numbers | RFC 3228 | 
| Internet Key Exchange (IKE) Attributes | 
| IKE Attributes | RFC 2409 | 
| Internet Key Exchange Version 2 (IKEv2) Parameters | 
| Authentication Methods | RFC 5996 | 
| Certificate Encodings | RFC 5996 | 
| Configuration Payload Attribute Types | RFC 5996 | 
| Configuration Payload CFG Types | RFC 5996 | 
| Diffie-Hellman Transform IDs | RFC 5996 | 
| Encryption Transform IDs | RFC 5996 | 
| Exchange Types | RFC 5996 | 
| Gateway Identity Types | RFC 5685 | 
| Identification Payload ID Types | RFC 5996 | 
| Integrity Algorithm Transform IDs | RFC 5996 | 
| Notification IPCOMP Transform IDs | RFC 5996 | 
| Notify Message Types | RFC 5996 | 
| Payload Types | RFC 5996 | 
| Pseudo-random Function Transform IDs | RFC 5996 | 
| ROHC Attribute Types | RFC 5857 | 
| Security Protocol Identifiers | RFC 5996 | 
| Traffic Selector Types | RFC 5996 | 
| Transform Attribute Types | RFC 5996 | 
| Transform Types | RFC 5996 | 
| Internet Message Access Protocol (IMAP) 4 Capabilities | 
| IMAP 4 Capabilities | RFC 3501 | 
| IMAP METADATA Mailbox Entry Registry | RFC 5464 | 
| IMAP METADATA Server Entry Registry | RFC 5464 | 
| IMAP Response Codes | RFC 5530 | 
| IMAP Threading Algorithms | RFC 5256 | 
| IMAP URLAUTH Access Identifiers and Prefixes | RFC 5593 | 
| IMAP URLAUTH Authorization Mechanism Registry | RFC 4467 | 
| IMAP4 List Extended | RFC 5258 | 
| Internet Message Store Events | 
| Event Names | RFC 5423 | 
| Event Parameters | RFC 5423 | 
| Internet Open Trading Protocol (IOTP) Codes | 
| IOTP Codes | RFC 2801 | 
| Internet Printing Protocol (IPP) Registrations | 
| Attribute Group Tags | RFC 2911 | 
| Attribute Syntaxes | RFC 2911 | 
| Attributes | RFC 3380 | 
| Enum Attribute Values | RFC 2911 | 
| Keyword Attribute Values | RFC 2911 | 
| Operations | RFC 2911 | 
| Out-of-Band Attribute Group Tags | RFC 2911 | 
| Status Codes | RFC 2911 | 
| Internet Protocol (IP) Option Numbers | 
| IP Option Numbers | RFC 2780 | 
| IP Time to Live Parameter | RFC (?) | 
| Recommended values for TOS | RFC (?) | 
| Internet Protocol (IP) Protocol Numbers | 
| Internet Protocol (IP) Protocol Numbers | RFC 5237 | 
| Internet Protocol (IP) Version Number | 
| IP TOS Paramters | RFC (?) | 
| IP Version Number | RFC 2780 | 
| Internet Protocol version 4 (IPv4) Address Space | 
| IPv4 Address Space | RFC 2050 | 
| IPv4 Special Purpose Address Registry | RFC 5736 | 
| Internet Protocol version 4 (IPv4) Router Alert Option Values | 
| IPv4 Router Alert Option Values | RFC 5350 | 
| Internet Protocol version 4 (IPv4) Type of Service (TOS) Byte and Internet Protocol version 6 (IPv6) Traffic Class Octet | 
| IPv4 TOS Byte and IPv6 Traffic Class Octet | RFC 3168 | 
| Internet Protocol version 6 (IPv6) Address Space | 
| IPv6 Address Space | RFC 2373 | 
| Internet Protocol version 6 (IPv6) Anycast Address Allocations | 
| IPv6 Anycast Address Allocations | RFC 4291, RFC 2526 | 
| IPv6 Anycast Subnet-Router Anycast Address | RFC 4291 | 
| Internet Protocol version 6 (IPv6) Global Unicast Allocations | 
| IANA IPv6 Special Purpose Address Registry | RFC 4773 | 
| IPv6 Global Unicast Allocations | RFC 2928 | 
| Internet Protocol Version 6 (IPv6) Low Power Personal Area Network Parameters | 
| Dispatch Type Field | RFC 4944 | 
| Short Address Fields | RFC 4944 | 
| Internet Protocol version 6 (IPv6) Multicast Address Allocations | 
| Address Allocations | RFC 3307 | 
| Internet Protocol version 6 (IPv6) Parameters | 
| Destination Options and Hop-by-Hop Options | RFC 2460, RFC 2780 | 
| Next Header Types | RFC 2460, RFC 2780 | 
| Routing Types | RFC 2460, RFC 5871 | 
| Internet Protocol version 6 (IPv6) Router Alert Option Values | 
| IPv6 Router Alert Option Values | RFC 2711 | 
| Internet Protocol version 6 (IPv6) Sub-Top Level Aggregation (TLA) Identifier Assignments | 
| IPv6 Sub-TLA Assignments (DEPRECATED) | RFC 2450 | 
| Internet Security Association and Key Management Protocol (ISAKMP) Identifiers | 
| IPSEC AH Transform Identifiers | RFC 2407 | 
| IPSEC ESP Transform Identifiers | RFC 2407 | 
| IPSEC Identification Type | RFC 2407 | 
| IPSEC IPCOMP Transform Identifiers | RFC 2407 | 
| IPSEC ISAKMP Transform Identifiers | RFC 2407 | 
| IPSEC Labeled Domain Identifiers | RFC 2407 | 
| IPSEC Notify Message Type | RFC 2407 | 
| IPSEC Security Association Attributes | RFC 2407 | 
| IPSEC Security Protocol Identifiers | RFC 2407 | 
| IPSEC Situation Definition | RFC 2407 | 
| ISAKMP Domain of Interpretation (DOI) | RFC 2408 | 
| Next Payload Types | RFC 2408 | 
| Signature Encoding Algorithm Values | RFC 4359 | 
| Internet Storage Name Service (iSNS) | 
| Block Storage Protocols | RFC 4171 | 
| Standard iSNS Attributes | RFC 4171 | 
| Internet/Xerox Network System (XNS) Protocol Mappings | 
| Internet/XNS Protocol Mappings | RFC 1764 | 
| Intrusion Detection Exchange Protocol (IDXP) | 
| Options | RFC 4767 | 
| Intrusion Detection Message Exchange Format (IDMEF) Parameters | 
| Attribute Values | RFC 4765 | 
| Class Names and Attribute Names | RFC 4765 | 
| IP Flow Information Export (IPFIX) | 
| IPFIX Information Elements | RFC 5102 | 
| IPFIX MPLS label type | RFC 5102 | 
| IPFIX Set IDs | RFC 5101 | 
| IPFIX Version Numbers | RFC 5101 | 
| IPS Protocol | 
| Protocol Number field | RFC 3643 | 
| IPSec | 
| asn1-modules | RFC 4301 | 
| IPsec Resource Record Parameters | 
| Algorithm Type Field | RFC 4025 | 
| Gateway Type Field | RFC 4025 | 
| IPv6 Multicast Permanent Group Identifiers | 
| Group Identifier Values | RFC 3307 | 
| IS-IS | 
| Bandwidth Constraints Model Identifiers | RFC 4124 | 
| IS-IS Multi-Topology ID Values | RFC 5120 | 
| Sub-TLVs for TLV 135 | RFC 5305 | 
| Sub-TLVs for TLV 22, 141, and 222 | RFC 5305, RFC 5316 | 
| TLV Codepoints | RFC 3563 | 
| iSCSI | 
| iSCSI authenication methods registry | RFC 3720 | 
| iSCSI digests registry | RFC 3720 | 
| iSCSI extended key registry | RFC 3720 | 
| SRP_GROUP key values | RFC 3720 | 
| Java Message Service (JMS) URI Scheme Variants | 
| JMS URI Scheme Variants | Internet Draft draft-merrick-jms-uri-12 | 
| Kerberized Internet Negotiation of Keys (KINK) | 
| Error Codes | RFC 4430 | 
| Message Types | RFC 4430 | 
| Next Payload Types | RFC 4430 | 
| Kerberos Parameters | 
| Checksum Type Numbers | RFC 3961 | 
| Encryption Type Numbers | RFC 3961 | 
| FAST Armor Types | Internet Draft draft-ietf-krb-wg-preauth-framework-17 | 
| FAST Options | Internet Draft draft-ietf-krb-wg-preauth-framework-17 | 
| Kerberos TCP Extensions | RFC 5021 | 
| Pre-authentication and Typed Data | Internet Draft draft-ietf-krb-wg-preauth-framework-17 | 
| Well-Known Kerberos Principal Names | Internet Draft draft-ietf-krb-wg-naming-07 | 
| Well-Known Kerberos Realm Names | Internet Draft draft-ietf-krb-wg-naming-07 | 
| KeyNote Parameters | 
| KeyNote app_domain Identifiers | RFC 2704 | 
| KeyNote Public Key Format Identifiers | RFC 2704 | 
| KeyNote Signature Algorithm Identifiers | RFC 2704 | 
| Label Distribution Protocol (LDP) Name Spaces | 
| Experiment ID Name Space | RFC 5036 | 
| Forwarding Equivalence Class (FEC) Type Name Space | RFC 5036 | 
| Message Type Name Space | RFC 5036 | 
| Status Code Name Space | RFC 5036 | 
| Type, Length, and Value (TLV) Type Name Space | RFC 5036 | 
| Language Tags | 
| Language Subtag Registry | RFC 5646 | 
| Language Subtag Registry - Registration Templates | RFC 5646 | 
| Language Tag Extensions Registry | RFC 5646 | 
| Language Tags - OBSOLETE | RFC 4646 | 
| Language Tags Directory - OBSOLETE | RFC 4646 | 
| Layer Two Tunneling Protocol (L2TP) Parameters | 
| ATM Alarm Status AVP (Attribute Type 88) Values | RFC 4454 | 
| ATM-Specific Sublayer bits | RFC 4454 | 
| Bearer Field definition | RFC 2661 | 
| Circuit Status Bits | RFC 3931 | 
| Control Message AVP's | RFC 3438 | 
| Data Sequencing Level | RFC 3931 | 
| Default L2-Specific Sublayer bits | RFC 3931 | 
| Framing Field definition | RFC 2661 | 
| L2-Specific Sublayer Type | RFC 3931 | 
| L2TPv3 Pseudowire Types | RFC 3931 | 
| Leading Bits of the L2TP AVP Header | RFC 2661, RFC 3931 | 
| Leading Bits of the L2TP Message Header | RFC 2661, RFC 3931 | 
| Message Type AVP (Attribute Type 0) Values | RFC 3438 | 
| PPP Disconnect Cause Code (Attribute Type 46) Values | RFC 3145 | 
| Proxy Authen Type AVP (Attribute Type 29) Values | RFC 2661 | 
| Result Code AVP (Attribute Type 1) Values | RFC 3438 | 
| Licklider Transmission Protocol (LTP) Parameters | 
| LTP Ciphersuites | RFC 5327 | 
| LTP Extension Tags | RFC 5326 | 
| Lightweight Directory Access Protocol (LDAP) | 
| Attribute Description Options | RFC 4520 | 
| Bind Authentication Method | RFC 4520 | 
| Internet Directory Numbers | RFC 2578, RFC 4520 | 
| LDAP authzid prefixes | RFC 4520 | 
| LDAP Filter Choices | RFC 4520 | 
| LDAP ModifyRequest Operations | RFC 4520 | 
| LDAP Search Scopes | RFC 4520 | 
| LDAP Syntaxes | RFC 4520 | 
| LDAPMessage types | RFC 4520 | 
| Object Identifier Descriptors | RFC 4520 | 
| pcimSchema LDAP Descriptors | RFC 3703 | 
| Protocol Mechanisms | RFC 4520 | 
| Result Code values | RFC 4520 | 
| Link Management Protocol (LMP) | 
| LMP Message Types | RFC 4204 | 
| LMP Object Class and Class Type (C-Type) | RFC 4204 | 
| Link Relations | 
| Link Relation Application Data | RFC 5988 | 
| Link Relation Types | RFC 5988 | 
| Location-to-Service Translation (LoST) | 
| LoST Location Profile Registry | RFC 5222 | 
| Machine Names | 
| Machine Names | RFC (?) | 
| Mail Content Disposition Values and Parameters | 
| Handling Parameter Values | RFC 3204 | 
| Mail Content Disposition Parameters | RFC 2183 | 
| Mail Content Disposition Values | RFC 2183 | 
| Voice Parameter Values | RFC 2421 | 
| Mail Parameters | 
| Address Literal Tags | RFC 5321 | 
| Diagnostic Types | RFC 3461, RFC 3464 | 
| Mail Address Types | RFC 3461, RFC 3464 | 
| Mail Encoding Header Field Keywords | RFC 1505 | 
| Mail Service Types | RFC (?) | 
| Mail System Names | (?) | 
| Mail Transmission Types | RFC 821, RFC 822, RFC 5321 | 
| MTA Name Types | RFC 3461, RFC 3464 | 
| SMTP Service Extensions | RFC 5321 | 
| Management Information Base (MIB) | 
| For all IANA maintained MIBs, please look under "IANA Maintained MIBs" | Other MIB related registries can be found at "Structure of Management Information (SMI) Numbers" | 
| Media Feature Tags | 
| features.global-tree | RFC 2506 | 
| features.ietf-tree | RFC 2506 | 
| features.sip-tree | RFC 3840 | 
| features.uri-tree | RFC 2506 | 
| Media Gateway Control Protocol (MGCP) | 
| List of Extension Digit Map Letters | RFC 3435 | 
| LocalConnectionsOptions Sub-Registry | RFC 3435 | 
| MGCP Package Sub-Registry | RFC 3435 | 
| Media Independent Handover | 
| MIH Table of Mappings From Service Field Values to Transport Protocols | RFC 5679 | 
| Megaco/H.248 Packages | 
| Error Codes | RFC 5125, RFC 5615 | 
| Private Packages | RFC 5125, RFC 5615 | 
| Profile Names | RFC 5125, RFC 5615 | 
| Public Packages | RFC 5125, RFC 5615 | 
| Service Change Reasons | RFC 5125, RFC 5615 | 
| Message Disposition Notification (MDN) Parameters | 
| MDN-Disposition-Modifier-Names | RFC 3798 | 
| MDN-Dispositon-Notification-Option Names | RFC 3798 | 
| MDN-Extension-Field-Names | RFC 3798 | 
| Message Header Fields | 
| Permanent Message Header Fields | RFC 3864 | 
| Provisional Message Header Fields | RFC 3864 | 
| Message Session Relay Protocol (MSRP) Parameters | 
| Header Fields | RFC 4975 | 
| Methods | RFC 4975 | 
| Status Codes | RFC 4975 | 
| Message Tracking Query Protocol (MTQP) | 
| Options | RFC 3887 | 
| Messaging Abuse Reporting Format (MARF) Parameters | 
| Feedback Report Header Fields | RFC 5965 | 
| Feedback Report Type Values | RFC 5965 | 
| Milnet Parameters | 
| Milnet Parameters | RFC (?) | 
| Mobile Ad hoc NETwork (MANET) Parameters | 
| Address Block TLV Types | RFC 5444 | 
| HELLO Message-Type-specific Address Block TLV Types | Internet Draft draft-ietf-manet-nhdp-15 | 
| HELLO Message-Type-specific Message TLV Types | Internet Draft draft-ietf-manet-nhdp-15 | 
| INTERVAL_TIME Address Block TLV Type Extensions | RFC 5497 | 
| INTERVAL_TIME Message Type Extensions | RFC 5497 | 
| LINK_STATUS Address Block TLV Type Extensions | Internet Draft draft-ietf-manet-nhdp-15 | 
| LOCAL_IF Address Block TLV Type Extensions | Internet Draft draft-ietf-manet-nhdp-15 | 
| Message TLV Types | RFC 5444 | 
| Message Types | RFC 5444 | 
| OTHER_NEIGHB Address Block TLV Type Extensions | Internet Draft draft-ietf-manet-nhdp-15 | 
| Packet TLV Types | RFC 5444 | 
| VALIDITY_TIME Address Block TLV Type Extensions | RFC 5497 | 
| VALIDITY_TIME Message Type Extensions | RFC 5497 | 
| Mobile Internet Protocol (IP) Numbers | 
| Access Technology Types | RFC 5563 | 
| Code Values | RFC 5944 | 
| Code Values for Mobile IP Handoff Reply Messages | RFC 4881 | 
| Dual Stack (DSMIPv4) Extension subtypes | RFC 5454 | 
| Dynamic HA Extension subtypes | RFC 4433 | 
| FA Error Extension subtypes (value 45) | RFC 4636 | 
| Generalized Link Layer Address Registration Extension Subtypes and Generalized Link Layer Address Advertisement Extension Subtypes | RFC 4881 | 
| IPv6 Prefix Reply Extension Codes | RFC 5454 | 
| Message String Extension | RFC 4917 | 
| Mobile Network Acknowledgement Extension | RFC 5177 | 
| NAI Carrying Extension Sub-types (Value 136) | RFC 3846 | 
| PMIPv4 Device ID Types | RFC 5563 | 
| PMIPv4 Non-skippable Extension | RFC 5563 | 
| PMIPv4 Per-Node Authentication Method Types | RFC 5563 | 
| PMIPv4 Skippable Extension | RFC 5563 | 
| PMIPv4 Subscriber ID Types | RFC 5563 | 
| Trusted Networks Configured (TNC) Extension subtypes | RFC 5265 | 
| User Datagram Protocol (UDP) Tunnel Reply Extension: Subtype | RFC 3519 | 
| User Datagram Protocol (UDP) Tunnel Request Extension: Subtype | RFC 3519 | 
| Mobile IPv6 | 
| Access Technology Type Option type values | RFC 5213 | 
| Binding Acknowledgment Flags | RFC 5213 | 
| Binding Revocation Acknowledgement Status Codes | RFC 5846 | 
| Binding Revocation Type | RFC 5846 | 
| Binding Update Flags | RFC 5213 | 
| Dual Stack MIPv6 (DSMIPv6) IPv4 Home Address Option Status Codes | RFC 5555 | 
| Enumerating Algorithms | RFC 4285 | 
| Handoff Indicator Option type values | RFC 5213 | 
| Handover Acknowledge Flags | Internet Draft draft-ietf-mipshop-pfmipv6-14 | 
| Handover Acknowledge Status Codes | Internet Draft draft-ietf-mipshop-pfmipv6-14 | 
| Handover Initiate Flags | Internet Draft draft-ietf-mipshop-pfmipv6-14 | 
| Handover Initiate Status Codes | Internet Draft draft-ietf-mipshop-pfmipv6-14 | 
| IPv4 DHCP Support Mode Flags | RFC 5844 | 
| IPv4 Home Address Reply Status Codes | RFC 5844 | 
| Mobile Node Identifier Option Subtypes | RFC 4283 | 
| Mobility Header Types | RFC 3775 | 
| Mobility Options | RFC 3775 | 
| Pseudo Home Address Acknowledgement Status Codes | RFC 5726 | 
| Revocation Trigger Values | RFC 5846 | 
| Status Codes | RFC 3775, RFC 5213 | 
| Status Codes (DNS Update Mobility Option) | RFC 5026 | 
| Subtype field of the MN-HA and MN-AAA authentication mobility options | RFC 4285 | 
| Multicast Address (IPv4) | 
| Address Assignments/Allocations | RFC 5771 | 
| Multicast Address Dynamic Client Allocation Protocol (MADCAP) Parameters | 
| MADCAP Error Codes | RFC 2730 | 
| MADCAP Feature Codes | RFC 2730 | 
| MADCAP Lease Identifier Types | RFC 2730 | 
| MADCAP Message Types | RFC 2730 | 
| MADCAP Options | RFC 2730 | 
| Multicast Address-Set Claim (MASC) Protocol Parameters | 
| Message Types | RFC 2909 | 
| NOTIFICATION Message Error Codes and Subcodes | RFC 2909 | 
| OPEN Message Optional Parameter Types | RFC 2909 | 
| UPDATE Message Attribute Types | RFC 2909 | 
| UPDATE Message Optional Parameter Types | RFC 2909 | 
| Multicast Source Discovery Protocol (MSDP) | 
| TLV Values | RFC 3618 | 
| Multimedia Internet KEYing (MIKEY) | 
| Key ID Types | RFC 4563 | 
| Payload Name Spaces | RFC 3830 | 
| Multiprotocol Label Switching Architecture (MPLS) | 
| Identifiers | RFC 3033 | 
| Label Switched Paths (LSPs) Parameters - Message Types | RFC 4379 | 
| Label Switched Paths (LSPs) Parameters - Reply Modes | RFC 4379 | 
| Label Switched Paths (LSPs) Parameters - Return Codes | RFC 4379 | 
| Label Switched Paths (LSPs) Parameters - TLVs | RFC 4379 | 
| MPLS Label Values | RFC 3032 | 
| Multipurpose Internet Mail Extensions (MIME) | 
| Access-Types | RFC 4289 | 
| Event code registry for audio/telephone-event | RFC 4733 | 
| Media Type Sub-Parameters | RFC 3640 | 
| Media Types | RFC 4288, RFC 4855 | 
| MIME / X.400 Mapping Tables | RFC 1494 | 
| Sub-parameter registry for application/mbox | RFC 4155 | 
| Sub-Parameter registry for audio/rtp-midi | RFC 4695 | 
| Sub-Parameter registry for mode=rtp-midi of audio/mpeg4-generic | RFC 4695 | 
| Sub-parameter registry for video/raw | RFC 4175 | 
| text/directory Parameters | RFC 2425 | 
| text/directory Profiles | RFC 2425 | 
| text/directory Types | RFC 2425 | 
| Namespace for IP Over IEEE 1394 | 
| CSR Protocol Identifiers | RFC 2734 | 
| Multicast Channel Allocation Protocol (MCAP) Parameters | RFC 2734, RFC 3146 | 
| Network Configuration Protocol (NETCONF) | 
| Capability URNs | RFC 4741 | 
| Network File System version 4 (NFSv4) | 
| NFSv4 ${ietf.org:CPU_ARCH} Value Registry | RFC 5661 | 
| NFSv4 ${ietf.org:OS_TYPE} Value Registry | RFC 5661 | 
| NFSv4 Device ID Notifications Registry | RFC 5661 | 
| NFSv4 Named Attribute Definitions Registry | RFC 5661 | 
| NFSv4 Path Variables Registry | RFC 5661 | 
| NFSv4 Recallable Object Types Registry | RFC 5661 | 
| pNFS Layout Types Registry | RFC 5661 | 
| Network Layer Protocol Identifiers (NLPIDs) | 
| NLPIDs of Interest | Internet Draft draft-eastlake-nlpid-iana-considerations-04 | 
| Network News Transfer Protocol (NNTP) | 
 | 
| Network News Transfer Protocol (NNTP) Parameters | RFC 3977 | 
| Network Time Protocol (NTP) Parameters | 
| NTP Extension Field Types | RFC 5905 | 
| NTP Kiss-o'-Death (KoD) Codes | RFC 5905 | 
| NTP Reference Identifier Codes | RFC 5905 | 
| Next Hop Resolution Protocol (NHRP) Types | 
| Extension Types | RFC 2332 | 
| Packet Types | RFC 2332 | 
| Novell Service Advisor Protocol (SAP) Numbers | 
| Novell Object Types | Not IETF | 
| NSIS Signaling Layer Protocol (NSLP) Parameters | 
| AUTH_ENT_ID (X-Type 1) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| DEST_ADDR (X-Type 4) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| END_TIME (X-Type 6) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| Informational Error Codes | RFC 5974 | 
| NATFW NSLP Header Flags | RFC 5973 | 
| NATFW NSLP Message Types | RFC 5973 | 
| NSLP Error Classes | RFC 5974, RFC 5973 | 
| NSLP Message Objects | RFC 5974 | 
| Permanent Failure Codes | RFC 5974 | 
| Protocol Error Codes | RFC 5974 | 
| QoS Model Error Codes | RFC 5975 | 
| QoS NSLP Binding Codes | RFC 5974 | 
| QoS NSLP Error Source Identifiers | RFC 5974 | 
| QoS NSLP Message Types | RFC 5974 | 
| SESSION_AUTH X-Types | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| SOURCE_ADDR (X-Type 3) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| START_TIME (X-Type 5) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| START_TIME (X-Type 5) SubType values | Internet Draft draft-ietf-nsis-nslp-auth-07 | 
| Success Error Codes | RFC 5974 | 
| Transient Failure Codes | RFC 5974 | 
| One Time Password (OTP) Parameters | 
| Algorithm Identifier | RFC 2289 | 
| Extension Set ID | RFC 2243 | 
| Open Shortest Path First (OSPF) | 
| Authentication Codes | RFC 2328 | 
| Bandwidth Constraints Model Identifiers | RFC 4124 | 
| Database Description (DD) Packet Flags | RFC 5838 | 
| Link Local Signalling TLV Identifiers (LLS Types) | RFC 5613 | 
| LLS Type 1 Extended Options and Flags | RFC 5613 | 
| Opaque Link-State Advertisements (LSA) Option Types | RFC 5250 | 
| OSPF Multi-Topology Routing | RFC 4915 | 
| Signature Algorithms | RFC 2154 | 
| Traffic Engineering TLVs | RFC 3630 | 
| Open Shortest Path First v2 (OSPFv2) | 
| OSPF Packet Type |  | 
| OSPF Router Information (RI) TLVs | RFC 4970 | 
| OSPF Router Informational Capability Bits | RFC 4970 | 
| OSPFv2 Grace LSA Top Level TLV | RFC 4940 | 
| OSPFv2 Link State (LS) Type |  | 
| OSPFv2 Options | RFC 4940 | 
| OSPFv2 Router LSA Link Type | RFC 4940 | 
| OSPFv2 Router Properties | RFC 4940 | 
| Open Shortest Path First v3 (OSPFv3) | 
| OSPFv3 Instance ID Address Family Values | RFC 5838 | 
| OSPFv3 LSA Function Codes | RFC 4970 | 
| OSPFv3 Options | RFC 4940 | 
| OSPFv3 Prefix Options | RFC 4940 | 
| OSPFv3 Router LSA Link Type | RFC 4940 | 
| OSPFv3 Router Properties Registry | RFC 5340 | 
| Open Systems Interconnection (OSI) Network Service Access Point Addresses (NSAPA) Internet Code Point | 
| OSI NSAPA Internet Code Point | RFC 4548 | 
| Operating System Names | 
| Operating System Names | RFC 952 | 
| Specific Parameters | RFC 3659 | 
| OPES Callout Protocol Core | 
| OCP Features | RFC 4037 | 
| Optimized Link State Routing Protocol (OLSR) | 
| Optimized Link State Routing Protocol (OLSR) | RFC 3626 | 
| PA-TNC Parameters | 
| PA-TNC Attribute Types | RFC 5792 | 
| PA-TNC Error Codes | RFC 5792 | 
| PA-TNC Remediation Parameters Types | RFC 5792 | 
| Packet Sampling (PSAMP) Parameters | 
| PSAMP selectorAlgorithm Identifiers | RFC 5476 | 
| Path Computation Element Protocol (PCEP) Numbers | 
| CLOSE Object Flag Field | RFC 5440 | 
| CLOSE Object Reason Field | RFC 5440 | 
| ERO Subobjects | RFC 5520 | 
| IRO Subobjects | RFC 5521 | 
| LOAD-BALANCING Object Flag Field | RFC 5440 | 
| LSPA Object Flag Field | RFC 5440 | 
| METRIC Object Flag Field | RFC 5440 | 
| METRIC Object T Field | RFC 5440 | 
| NO-PATH Object Flag Field | RFC 5440 | 
| NO-PATH Object NI Field | RFC 5440 | 
| NO-PATH-VECTOR TLV Flag Field | RFC 5440 | 
| Notification Object | RFC 5440 | 
| Notification Object Flag Field | RFC 5440 | 
| Objective Function | RFC 5541 | 
| Open Object Flag Field | RFC 5440 | 
| PATH-KEY Subobjects | RFC 5520 | 
| PCEP Message Common Header Flag Field | RFC 5440 | 
| PCEP Messages | RFC 5440 | 
| PCEP Objects | RFC 5440 | 
| PCEP TLV Type Indicators | RFC 5440 | 
| PCEP-ERROR Object Error Types and Values | RFC 5440 | 
| PCEP-ERROR Object Flag Field | RFC 5440 | 
| RP Object Flag Field | RFC 5440 | 
| SVEC Object Flag Field | RFC 5440 | 
| XRO Flag Field | RFC 5521 | 
| XRO Subobjects | RFC 5521 | 
| PB-TNC Parameters | 
| PA Subtypes | Internet Draft draft-ietf-nea-pb-tnc-06 | 
| PB-TNC Error Codes | RFC 5793 | 
| PB-TNC Message Types | RFC 5793 | 
| PB-TNC Remediation Parameters Types | RFC 5793 | 
| Per Hop Behavior Identification Codes | 
| ID Codes | RFC 3140 | 
| PKIX Parameters | 
| PKIX SRV Protocol Labels | RFC 4386 | 
| Point to Point Protocol (PPP) Numbers | 
| Bridging MAC Types | RFC 3518, RFC 3818 | 
| Internet Packet Exchange (IPX) Compression Protocol Values | RFC 1552 | 
| Internet Packet Exchange (IPX) Routing Protocol Options | RFC 1552 | 
| Internet Protocol (IP) Header Compression Configuration Option Suboption Types | RFC 3544 | 
| Internetwork Packet Exchange Control Protocol (IPXCP) Configuration Options | RFC 1552 | 
| IP Header Compression Configuration Option Suboption Types | RFC 3544 | 
| IP-Compression-Protocol Types | RFC 1322 | 
| IPv6-Compression-Protocol | RFC 5172 | 
| Link Control Protocol (LCP) Callback Operation Fields | RFC 1570, RFC 3818 | 
| Multilink Endpoint Discriminator Class | RFC 1990, RFC 3818 | 
| NetBIOS Frames Control Protocol (NBFCP) Configuration Options | RFC 2097 | 
| PPP Apple Talk Control Protocol (ATCP) Configuration Option Types | RFC 1378 | 
| PPP Authentication Algorithms | RFC 1994 | 
| PPP Banyan Vines Control Protocol (BVCP) Configuration Option Types | RFC 1763 | 
| PPP Bridging Configuration Option Types | RFC 3518, RFC 3818 | 
| PPP Bridging Spanning Tree | RFC 3518, RFC 3818 | 
| PPP Compression Control Protocol (CCP) Configuration Option Types | RFC 1962, RFC 3818 | 
| PPP Data Link Layer (DLL) Protocol Numbers | RFC 1661, RFC 3818 | 
| PPP Encryption Control Protocol (ECP) Configuration Option Types | RFC 1968 | 
| PPP Extensible Authentication Protocol (EAP) Request/Response Types | RFC 3748 | 
| PPP Internet Protocol Control Protocol (IPCP) Configuration Option Types | RFC 1332, RFC 3818 | 
| PPP IPv6CP Configuration Options | RFC 5072, RFC 3818 | 
| PPP Link Control Protocol (LCP) Configuration Option Types | RFC 1661, RFC 3818 | 
| PPP Link Control Protocol (LCP) FCS-Alternatives | RFC 1570, RFC 3818 | 
| PPP Link Control Protocol (LCP), Compression Control Protocol (CCP), and Internet Protocol Control (IPCP) Codes | RFC 1661, RFC 3818 | 
| PPP OSI Network Layer Control Protocol (OSINLCP) Configuration Option Types | RFC 1377 | 
| PPP Vendor Specific Organizationally Unique Identifiers (OUI) Options | RFC 5342 | 
| Robust Header Compression (ROHC) Configuration Option Suboption Identifier Values | RFC 3241, RFC 4901 | 
| Serial Data Control Protocol (SDCP) Configuration Options | RFC 1963 | 
| Point-to-Point Over Ethernet (PPPoE) | 
| PPPoE Active Discovery Code fields | RFC 4937 | 
| PPPoE TAG Values | RFC 4937 | 
| Port Numbers | 
| System | RFC 2780 | 
| User | RFC 2780 | 
| Portable Symmetric Key Container (PSKC) | 
| Algorithm URI Registry and Related PSKC Arofiles | RFC 6030 | 
| Key Usage Registry | RFC 6030 | 
| PSKC Version Registry | RFC 6030 | 
| Post Office Protocol version 3 (POP3) Extension Mechanism | 
| POP3 Capabilities | RFC 2449 | 
| POP3 Response Codes | RFC 2449 | 
| Preemption Namespace Registry | 
| Preemption Namespaces | RFC 4411 | 
| Presence SRV Protocol | 
| Label Registry | RFC 3861 | 
| Pretty Good Privacy (PGP) | 
| Compression Algorithms | RFC 4880 | 
| Hash Algorithms | RFC 4880 | 
| Image Format Subpacket Types | RFC 4880 | 
| Implementation Features | RFC 4880 | 
| Key Flags Extensions | RFC 4880 | 
| Key Server Preference Extensions | RFC 4880 | 
| New Packet Versions | RFC 4880 | 
| PGP Packet Types/Tags | RFC 4880 | 
| PGP String-to-Key (S2K) | RFC 4880 | 
| PGP User Attribute Types | RFC 4880 | 
| Public Key Algorithms | RFC 4880 | 
| Reasons for Revocation Extensions | RFC 4880 | 
| Signature Notation Data Subpacket Types | RFC 4880 | 
| Signature Subpacket Types | RFC 4880 | 
| Symetric Key Algorithms | RFC 4880 | 
| Printer Language Numbers | 
| Printer Language Numbers | RFC 3805 | 
| Pronet 80 Type Numbers | 
| Pronet 80 Type Numbers | Not IETF | 
| Protocol for Carrying Authentication for Network Access (PANA) Parameters | 
| AVP Codes | RFC 5191 | 
| AVP Flags | RFC 5191 , RFC 5872 | 
| Message Flags | RFC 5191 , RFC 5872 | 
| Message Types | RFC 5191 , RFC 5872 | 
| Result-Code (AVP Code 7) AVP Values | RFC 5191 , RFC 5872 | 
| Termination-Cause (AVP Code 9) AVP Values | RFC 5191 , RFC 5872 | 
| Protocol Independent Multicast (PIM) | 
| Encoded-Source Address Encoding Type Field | RFC 4601, RFC 5384 | 
| PIM Address Family Numbers | RFC 3973 | 
| PIM Hello Options | RFC 4601, RFC 3973 | 
| PIM Join Attribute Types | RFC 5384 | 
| Protocol Names | 
| Protocol Names | RFC 952 | 
| Proxy Certificate Policy | 
| Languages | RFC 3820 | 
| Pseudowire Name Spaces (PWE3) | 
| Associated Channel Header TLV Registry | RFC 5586 | 
| Attachment Group Identifier (AGI) Type Registry | RFC 4446 | 
| Attachment Individual Identifier Type Registry | RFC 4446 | 
| MPLS Pseudowire Types Registry | RFC 4446 | 
| Pseudowire Associated Channel Types Registry | RFC 4385 | 
| Pseudowire Interface Parameters Sub-TLV Type Registry | RFC 4446 | 
| Pseudowire Status Codes Registry | RFC 4446 | 
| Pseudowire Switching Point PE sub-TLV Type | Internet Draft draft-ietf-pwe3-segmented-pw-18 | 
| Public Data Network Numbers | 
| Public Data Network Numbers | RFC 1356 | 
| Publisher Identification Codes | 
| Publisher ID Codes | RFC 2780 | 
| QoS NSIS Signal Layering Protocol (NSLP) QSPEC Parameters | 
| Excess Treatment Parameter | RFC 5975 | 
| Extent of Restoration Field | RFC 5976 | 
| Object Types | RFC 5975 | 
| Parameter ID | RFC 5975 | 
| QSPEC Procedure | RFC 5975 | 
| QSPEC Type | RFC 5975 | 
| QSPEC Version | RFC 5975 | 
| Restoration Priority Field | RFC 5976 | 
| Time to Restore Field | RFC 5976 | 
| Y.1541 QoS Class Parameter | RFC 5975 | 
| Y.2171 Admission Priority Parameter | RFC 5975 | 
| Radius Types | 
| Radius Attribute Types | RFC 3575 | 
| Radius Attribute Values | RFC 3575 | 
| Radius Packet Type Codes | RFC 3575 | 
| Vendor IDs | RFC 2865 | 
| Real Time Streaming Protocol (RTSP)/1.0 Parameters | 
| RTSP/1.0 Headers | RFC 2326 | 
| RTSP/1.0 Methods | RFC 2326 | 
| RTSP/1.0 Option Tags | RFC 2326 | 
| RTSP/1.0 Status Codes | RFC 2326 | 
| Real-Time Transport Protocol (RTP) Parameters | 
| FMT Values for RTPFB and PSFB Payload Types | RFC 4585 | 
| RAMS Response Code Space Registry | Internet Draft draft-ietf-avt-rapid-acquisition-for-rtp-17 | 
| RAMS TLV Space Registry | Internet Draft draft-ietf-avt-rapid-acquisition-for-rtp-17 | 
| Real-Time Transport Protocol (RTP) Payload Format media types | RFC 4855 | 
| Real-Time Transport Protocol (RTP) Payload types (PT) for standard audio and video encodings | RFC 3551 | 
| Real-Time Transport Protocol (RTP) Profile Names | RFC 3550 | 
| RTP Compact Header Extensions | Internet Draft draft-ietf-avt-rtp-hdrext-15 | 
| RTP RTCP Control Packet Types | Internet Draft draft-ietf-avt-rtp-and-rtcp-mux-07 | 
| RTP SDES Item Types | RFC 3550 | 
| SFMT Values for RAMS Messages | Internet Draft draft-ietf-avt-rapid-acquisition-for-rtp-17 | 
| Realm Specific Internet Protocol (RSIP) Parameters | 
| Address Types | RFC 3103 | 
| Flow Policy | RFC 3103 | 
| RSIP Error Codes | RFC 3103 | 
| RSIP Message Type Codes | RFC 3103 | 
| RSIP Methods | RFC 3103 | 
| RSIP Parameters | RFC 3103 | 
| Tunnel Types | RFC 3103 | 
| Vendor ID | RFC 3103 | 
| Realtime Traffic Flow Measurement (RTFM) | 
| Pattern Matching Engine (PME) Opcodes | RFC 2722 | 
| RTFM Attributes | RFC 2722 | 
| Registrar Identification Codes | 
| Registrar ID Codes | Not defined by an RFC | 
| Reliable Multicast Transport (RMT) Parameters | 
| FEC Encoding IDs | RFC 5052 | 
| FEC Instance IDs | RFC 5052 | 
| Layered Coding Transport (LCT) Header Extension Types | RFC 5651 | 
| NACK-Oriented Reliable Multicast (NORM) Stream Control Codes | RFC 5740 | 
| Negative-ACKnowledgment (NACK) Oriented Reliable Multicast (NORM) Header Extension Types | RFC 5740 | 
| NORM_CMD Message Sub-types | RFC 5740 | 
| Reliable Server Pooling (RSerPool) Parameters | 
| Aggregate Server Access Protocol (ASAP) Message Types | RFC 5352 | 
| Endpoint Handlespace Redundancy Protocol (ENRP) Message Types | RFC 5353 | 
| RSerPool Error Causes | RFC 5354 | 
| RSerPool Parameter Types | RFC 5354 | 
| RSerPool Policy Types | RFC 5356 | 
| Update Action Types | RFC 5353 | 
| Remote Framebuffer (RFB) | 
| Remote Framebuffer Client to Server Message Types | Internet Draft draft-levine-rfb-03 | 
| Remote Framebuffer Encoding Types | Internet Draft draft-levine-rfb-03 | 
| Remote Framebuffer Security Types | Internet Draft draft-levine-rfb-03 | 
| Remote Framebuffer Server to Client Message Types | Internet Draft draft-levine-rfb-03 | 
| Remote Procedure Call (RPC) | 
| Network Identifier (r_netid) | RFC 3530 | 
| ONC RPC Network Identifiers (netids) | RFC 5665 | 
| ONC RPC Uaddr Format Registry | RFC 5665 | 
| Protocol Family (r_nc_protofmly) | RFC 1833 | 
| Protocol Name (r_nc_proto) | RFC 1833 | 
| RPC Authentication Flavor Numbers | RFC 5531 | 
| RPC Authentication Status Numbers | RFC 5531 | 
| RPC Program Numbers | RFC 5531 | 
| Transport Semantics (r_nc_semantics) | RFC 1833 | 
| Reserved Internet Protocol version 6 (IPv6) Interface Identifiers | 
| Reserved Internet Protocol version 6 (IPv6) Interface Identifiers | RFC 5453 | 
| Resource ReSerVation Protocol (RSVP) Parameters | 
| Call Attributes Flags | RFC 6001 | 
| Call Attributes TLV | RFC 6001 | 
| Capability Object values | RFC 5063 | 
| Class Names, Class Numbers, and Class Types | RFC 3936 | 
| Error Codes and Globally-Defined Error Value Sub-Codes | RFC 3936 | 
| Message Types | RFC 3936 | 
| Sub-error code "Diffserv Error" (Value 27) | RFC 3270 | 
| Virtual Destination Ports | RFC 2207 | 
| Resource ReSerVation Protocol - Traffic Engineering (RSVP-TE) Parameters | 
| Attribute Flags | RFC 5420 | 
| Attributes TLV Space | RFC 5420 | 
| Session Attribute Object Flags | RFC 4859 | 
| RObust Header Compression (ROHC) | 
| Profile Identifiers | RFC 5795 | 
| Suboption Identifier Values | RFC 3241 | 
| Route Distinguisher Types | 
| Type Values | RFC 4364 | 
| Routing Information Protocol (RIP) Types | 
| Message Types | RFC 1723 | 
| RTP Control Protocol Extended Reports (RTCP XR) | 
| Block Types | RFC 3611 | 
| SDP Parameters | RFC 3611 | 
| S-NAPTR Parameters | 
| Application Protocol Tags | RFC 3958 | 
| Application Service Tags | RFC 3958 | 
| Secure Shell (SSH) Protocol Parameters | 
| Authentication Method Names | RFC 4250 | 
| Channel Connection Failure Reason Codes and Descriptions | RFC 4250 | 
| Compression Algorithm Names | RFC 4250 | 
| Connection Protocol Assigned Names - Channel Request Names | RFC 4250 | 
| Connection Protocol Assigned Names - Channel Types | RFC 4250 | 
| Connection Protocol Assigned Names - Global Request Names | RFC 4250 | 
| Connection Protocol Assigned Names - Subsystem Names | RFC 4250 | 
| Disconnection Messages Reason Codes and Descriptions | RFC 4250 | 
| Encryption Algorithm Names | RFC 4250 | 
| Extended Channel Data Transfer data_type_code and Data | RFC 4250 | 
| Key Exchange Method Names | RFC 4250 | 
| MAC Algorithm Names | RFC 4250 | 
| Message Numbers | RFC 4250 | 
| Pseudo-Terminal Encoded Terminal Modes | RFC 4250 | 
| Public Key Algorithm Names | RFC 4250 | 
| Publickey Subsystem Attributes | RFC 4819 | 
| Publickey Subsystem Request Names | RFC 4819 | 
| Publickey Subsystem Response Names | RFC 4819 | 
| Publickey Subsystem Status Codes | RFC 4819 | 
| Service Names | RFC 4250 | 
| Signal Names | RFC 4250 | 
| SSH Public-Key File Header Tags | RFC 4716 | 
| Security Parameters Index | 
| SPI Values | RFC 1826, RFC 2402, RFC 2406, RFC 4302, RFC 4303 | 
| Selective P-Multicast Service Interface (S-PMSI) Parameters | 
| S-PMSI Join Message Type Field | Internet Draft draft-ietf-l3vpn-2547bis-mcast-10 | 
| Server Cache Synchronization Protocol (SCSP) Parameters | 
| Protocol ID's | RFC 2334 | 
| Service Location Protocol (SLP) Parameters | 
| SLP Remote Service Discovery | RFC 3832 | 
| Service Location Protocol Version 2 (SLPv2) Registrations | 
| Cryptographic BSD Codes | RFC 2608 | 
| Error Numbers | RFC 2608 | 
| SLPv2 Function ID's | RFC 2608 | 
| Service Names | 
| Service Names | RFC 952 | 
| Session Description Protocol (SDP) Parameters | 
| ack and nack Attribute Values | RFC 4585 | 
| Codec Control Messages | RFC 5104 | 
| QoS Mechanism Tokens | RFC 5432 | 
| rtcp-fb Attribute Values | RFC 4585 | 
| SDP Key Methods | RFC 4568 | 
| SDP Media Stream Transports | RFC 4568 | 
| SDP Parameters addrtype | RFC 4566 | 
| SDP Parameters att-field (both session and media level) | RFC 4566 | 
| SDP Parameters att-field (media level only) | RFC 4566 | 
| SDP Parameters att-field (session level) | RFC 4566 | 
| SDP Parameters att-field (unknown level) | RFC 4566 | 
| SDP Parameters bwtype | RFC 4566 | 
| SDP Parameters content | RFC 4796 | 
| SDP Parameters enckey | RFC 4566 | 
| SDP Parameters nettype | RFC 4566 | 
| SDP Parameters proto | RFC 4566 | 
| SDP/RTSP key management protocol identifiers | RFC 4567 | 
| Semantics for the "group" SDP Attribute | RFC 5888 | 
| SRTP Crypto Suite Registrations | RFC 4568 | 
| SRTP Session Parameters | RFC 4568 | 
| Session Initiation Protocol (SIP) Parameters | 
| Compression Schemes | RFC 3486 | 
| Event Packages | RFC 3427, RFC 3265, RFC 5727 | 
| Event Template Packages | RFC 3427, RFC 3265, RFC 5727 | 
| Header Field Parameters and Parameter Values | RFC 3968 | 
| Header Fields | RFC 3261, RFC 3427, RFC 5727 | 
| Identity-Info Algorithm Parameter Values | RFC 4474 | 
| Identity-Info Parameters | RFC 4474 | 
| Methods and Response Codes | RFC 3261, RFC 3427, RFC 5727 | 
| Option Tags | RFC 3261, RFC 3427, RFC 5727 | 
| Precondition Types used with SIP | RFC 3312 | 
| Reason Protocols | RFC 3326 | 
| Field | RFC 3263 | 
| Resource-Priority Priority Values | RFC 4412 | 
| Security Mechanism Names | RFC 3329 | 
| SIP/SIPS URI Parameters | RFC 3969, RFC 5727 | 
| Warning Codes | RFC 3261, RFC 3427 | 
| Session Initiation Protocol (SIP) Parameters | 
| Info Packages Registry | RFC 6086 | 
| Service-ID/Application-ID Labels | RFC 6050 | 
| SIP Configuration Profile Types | Internet Draft draft-ietf-sipping-config-framework-18 | 
| SIP Forum User Agent Configuration Parameters | RFC 6011 | 
| Session Initiation Protocol (SIP) Privacy Header Values | 
| Header Values | RFC 3323 | 
| Session Traversal Utilities for NAT (STUN) Parameters | 
| STUN Attributes | RFC 5389 | 
| STUN Error Codes | RFC 5389 | 
| STUN Methods | RFC 5389 | 
| Traversal Using Relays around NAT (TURN) Channel Numbers | Internet Draft draft-ietf-behave-turn-16 | 
| Shim6 Parameters | 
| Shim6 Error Codes | RFC 5533 | 
| Shim6 Options | RFC 5533 | 
| Shim6 Types | RFC 5533 | 
| Shim6 Verification Methods | RFC 5533 | 
| Sieve Extensions | 
| Extensions | RFC 5228 | 
| ManageSieve Capabilities | RFC 5804 | 
| ManageSieve Response Codes | RFC 5804 | 
| Notification Mechanisms | RFC 5435 | 
| Notification-Capability Parameters | RFC 5435 | 
| Sieve Environment Items | RFC 5183 | 
| SIG | 
| SIG (0) Algorithm Numbers | Internet Draft draft-ietf-dnsext-dnssec-2535typecode-chan | 
| Signaling Compression (SigComp) |  | 
| Namespace | RFC 3320 | 
| Signaling User Adaptation Layer Assignments | 
| Message Classes | RFC 4666, RFC 4233, RFC 4165, RFC 4129, RFC 3868, RFC 3807, RFC 3788, RFC 3331 | 
| Message Parameters | RFC 4666, RFC 4233, RFC 4165, RFC 4129, RFC 3868, RFC 3807, RFC 3788, RFC 3331 | 
| Message Types | RFC 3331, RFC 4666 | 
| Simple Authentication and Security Layer (SASL) Mechanisms | 
| SASL Mechanisms | RFC 4422 | 
| Simple Gateway Monitoring Protocol (SGMP) Vendor Specific Codes | 
| SGMP Vendor Specific Codes (Obsolete) | RFC 1028 | 
| Simple Mail Transfer Protocol (SMTP) Enhanced Status Codes | 
| Class Sub-Codes | RFC 5248 | 
| Enumerated Status Codes | RFC 5248 | 
| Subject Sub-Codes | RFC 5248 | 
| Simple Mail Transfer Protocol (SMTP) Service Extensions | 
| Keywords | RFC 1869 | 
| Simple Network Management Protocol (SNMP) Number Spaces | 
| Message Processing Models | RFC 3411 | 
| Security Models | RFC 3411 | 
| SNMP Transport Domains | RFC 2578, RFC 3417, RFC 5590 | 
| snmpAuthProtocols | RFC 3411 | 
| SnmpEngineID Formats | RFC 3411 , RFC 5343 | 
| snmpPrivProtocols | RFC 3411 | 
| Snoop | 
| Datalink Types | RFC 3827 | 
| SOCKS Methods | 
| SOCKS Method Values | RFC 1928 | 
| Special Peoples Number Registry (SPNR) | 
| Special Peoples Number Registry (SPNR) | n/a | 
| Stream Control Transmission Protocol (SCTP) Parameters | 
| Adaptation Code Points | RFC 5061 | 
| Chunk Flags | RFC 6096 | 
| Chunk Parameter Types | RFC 4960 | 
| Chunk Types | RFC 4960 , RFC 6096 | 
| Error Cause Codes | RFC 4960 | 
| HMAC IDENTIFIERS | RFC 4895 | 
| SCTP Payload Protocol Identifiers | RFC 4960 | 
| Stringprep Profiles | 
| Profile Names | RFC 3454 | 
| Structure of Management Information (SMI) Numbers | 
| Experimental Numbers | RFC 4181, RFC 2578, RFC 1155 | 
| ifType definitions | RFC 1213, RFC 2863 | 
| Message Processing Models | RFC 3411 | 
| mib-2 Numbers | RFC 1213, RFC 2578 | 
| Misc Parameters | (?) | 
| mplsStdMIB (SIC) | RFC 4802 | 
| Security Models | RFC 3411 | 
| SMI pib Codes | RFC 3159 | 
| SMI Security for Mechanism msec Codes | (?) | 
| SMI Security for Mechanism msec content-types | RFC 4534 | 
| SMI Security for Mechanism msec data-policies | RFC 4534 | 
| SMI Security for Mechanism msec distributed-operations-methods | RFC 4534 | 
| SMI Security for Mechanism msec module-identifers | RFC 4534 | 
| SMI Security for Mechanism msec protocol-identifiers | RFC 4534 | 
| SMI Security for Mechanism msec rekey-methods | RFC 4534 | 
| SMI Security for Mechanism msec rekey-reliability-methods | RFC 4534 | 
| SMI Security for Mechanism msec security-suites | RFC 4534 | 
| SMI SNMPv2 Codes | RFC 2578 | 
| spdActions | RFC 4807 | 
| Transmission Numbers | RFC 1213 | 
| Structured Data Exchange Format (SDXF) Parameters | 
| Compression Methods for SDXF | RFC 3072 | 
| Encryption Methods for SDXF |  | 
| Subsequent Address Family Identifier (SAFI) Parameters | 
| SAFI Values | RFC 4760 | 
| SVRLOC Extensions | 
| Service Extensions | RFC 2608 | 
| SVRLOC Templates | 
| Service Templates | RFC 2609 | 
| Syslog Parameters | 
| Syslog Message Facilities | RFC 3164 | 
| Syslog Message Severities | RFC 3164 | 
| syslog Structured Data ID Values | RFC 5424 | 
| syslog Version Values | RFC 5424 | 
| syslog-sign Hash Algorithm Values | RFC 5848 | 
| syslog-sign Key Blob Type Values | RFC 5848 | 
| syslog-sign Protocol Version Values | RFC 5848 | 
| syslog-sign SG Field Values | RFC 5848 | 
| syslog-sign Signature Scheme Values | RFC 5848 | 
| Telephony Routing over IP (TRIP) Parameters | 
| TRIP Address Families | RFC 3219 | 
| TRIP Application Protocols | RFC 3219 | 
| TRIP Attributes | RFC 3219 | 
| TRIP Capabilities | RFC 3219 | 
| TRIP IP Telephony Administrative Domain (ITAD) Numbers | RFC 3219 | 
| Telnet Options | 
| Options | RFC 855 | 
| Sub-options | RFC 855 | 
| Terminal Type Names | 
| Terminal Type Names | RFC 1091 | 
| Timed Efficient Stream Loss-tolerant Authentication (TESLA) Parameters | 
| TESLA-MAC Values | RFC 4442 | 
| TESLA-PRF Values | RFC 4442 | 
| Trailer Types | 
| Trailer Types | RFC 6081 | 
| Transfer Encodings | 
| Transfer Encoding Names | RFC 4289 | 
| Transmission Control Protocol (TCP) Header Flags | 
| Header Flags | RFC 2780, RFC 3168 | 
| Transmission Control Protocol (TCP) Parameters | 
| Cryptographic Algorithms for TCP-AO Registration | Internet Draft draft-ietf-tcpm-tcp-ao-crypto-03 | 
| TCP Alternate Checksum Numbers | RFC 1146 | 
| TCP Option Numbers | RFC 2780 | 
| Transparent Interconnection of Lots of Links (TRILL) Parameters | 
| TRILL Multicast Addresses | Internet Draft draft-ietf-trill-rbridge-protocol-16 | 
| TRILL Nicknames | Internet Draft draft-ietf-trill-rbridge-protocol-16 | 
| Transport Layer Security (TLS) | 
| Alert Registry | RFC 5246 | 
| Certificate Types | RFC 6091 | 
| Cipher Suite Registry | RFC 5246 | 
| ClientCertificateType Identifiers Registry | RFC 5246 | 
| Compression Method Identifiers | RFC 3749 | 
| ContentType Registry | RFC 5246 | 
| EC Curve Type Registry | RFC 4492 | 
| EC Named Curve Registry | RFC 4492 | 
| EC Point Format Registry | RFC 4492 | 
| ExtensionType Values | RFC 5246 | 
| HandshakeType Registry | RFC 5246 | 
| HashAlgorithm Registry | RFC 5246 | 
| SignatureAlgorithm Registry | RFC 5246 | 
| TLS Authorization Data Formats | RFC 5878 | 
| TLS Exporter Label Registry | RFC 5705 | 
| TLS Supplemental Data Formats (SupplementalDataType) | RFC 4681 | 
| TLS UserMappingType Values | RFC 4681 | 
| TSIG Algorithm Names | 
| Algorithm Names | RFC 2845 | 
| Tunnel Setup Protocol (TSP) Parameters | 
| Tunnel Types | RFC 5572 | 
| Two-way Active Measurement Protocol (TWAMP) | 
| TWAMP-Control Command Numbers | RFC 5357, RFC 5938 | 
| TWAMP-Modes | RFC 5618, RFC 5938 | 
| Undirectional Lightweight Encapsulation (ULE) | 
| Next-Header Registry | RFC 4326 | 
| Uniform Resource Identifier (URI) Schemes | 
| geo URI crs Parameter Values | RFC 5870 | 
| geo URI Parameters | RFC 5870 | 
| tel URI Parameters | RFC 5341 | 
| URI Schemes | RFC 4395 | 
| Well-Known URIs | RFC 5785 | 
| Uniform Resource Names (URN) | 
| Formal Namespaces | RFC 3406 | 
| Informal Namespace Templates | RFC 3406 | 
| Informal Namespaces | RFC 3406 | 
| Service URN Labels | RFC 5031 | 
| VCDIFF Secondary Compressor ID Values | 
| VCDIFF Secondary Compressor ID Values | RFC 3284 | 
| Version Numbers | 
| Version Numbers | RFC 2780 | 
| Version Symbols Used Within the Integrated Services User Port (ISUP) and QSIG | 
| Application/ISUP Symbols | RFC 3204 | 
| Application/QSIG Symbols | RFC 3204 | 
| WAVE and AVI Codec Registries | 
| WAVE and AVI Codes Registries (Historic Registry) | RFC 2361 | 
| Wrapped Encapsulating Security Payload (WESP) | 
| WESP Flags | RFC 5840 | 
| WESP Version Numbers | RFC 5840 | 
| X.25 Type Numbers | 
| X.25 Type Numbers | Not defined by an RFC | 
| Xerox Network System (XNS) Protocol Types | 
| Assigned Internet Packet Types | Not defined by an RFC | 
| Assigned Well-Known Socket Numbers | Not defined by an RFC | 
| XML - Extensible Markup Language | 
| IETF XML Registry | RFC 3688 | 
| XML-XCAP Application Unique IDs | RFC 4825 | 
| YANG Parameters | 
| YANG Module Names | RFC 6020 | 
 
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