List of RFCs
This is a partial list of RFCs. A Request for Comments is a publication in a series from the principal technical development and standards-setting bodies for the Internet, most prominently the Internet Engineering Task Force.
While there are over 9,901 RFCs as of November 2025, this list consists of RFCs that have related articles. A complete list is available from the IETF website.
Numerical list
| # | Title | Date published | Related article | Made obsolete by | Notes |
| ASCII format for Network Interchange | October 16, 1969 | ASCII | |||
| Message Data Types | 31 March 1970 | ||||
| User Datagram Protocol | August 28, 1980 | UDP | |||
| THE TFTP PROTOCOL | June 1981 | TFTP | RFC 1350 | ||
| Internet Protocol | September 1981 | IPv4 | |||
| INTERNET CONTROL MESSAGE PROTOCOL | September 1981 | ICMP | |||
| TRANSMISSION CONTROL PROTOCOL | September 1981 | TCP | RFC 9293 | ||
| An Ethernet Address Resolution Protocol | November 1982 | ARP | |||
| TELNET PROTOCOL SPECIFICATION | May 1983 | Telnet | |||
| TELNET OPTION SPECIFICATIONS | May 1983 | Telnet | |||
| Echo Protocol | May 1983 | Echo | |||
| Discard Protocol | May 1983 | DISCARD | |||
| Character Generator Protocol | May 1983 | CHARGEN | |||
| Time Protocol | May 1983 | TIME | |||
| A Reverse Address Resolution Protocol | June 1984 | RARP | |||
| POST OFFICE PROTOCOL - VERSION 2 | February 1985 | POP v 2 | |||
| BOOTSTRAP PROTOCOL | September 1985 | BOOTP | |||
| FILE TRANSFER PROTOCOL | October 1985 | FTP | |||
| DOMAIN NAMES - CONCEPTS AND FACILITIES | November 1987 | DNS | |||
| DOMAIN NAMES - IMPLEMENTATION AND SPECIFICATION | November 1987 | DNS | |||
| Standard for Interchange of USENET Messages | December 1987 | Usenet | |||
| A Non-Standard for Transmission of IP Datagrams Over Serial Lines: SLIP | June 1988 | Serial Line [Internet Protocol|SLIP] | |||
| Routing Information Protocol | June 1988 | RIP v 1 | |||
| Network Time Protocol specification and implementation | July 1988 | NTP v 1 | |||
| Ethics and the Internet | January 1989 | Internet Ethics | |||
| The Hitchhikers Guide to the Internet | September 1989 | The Hitchhikers Guide to the Internet | |||
| Network Time Protocol specification and implementation | September 1989 | NTP v 2 | |||
| A Standard for the Transmission of IP Datagrams on Avian Carriers | April 1, 1990 | IP over Avian Carriers | |||
| A Simple Network Management Protocol | May 1990 | SNMP v1 | |||
| INTERACTIVE MAIL ACCESS PROTOCOL - VERSION 2 | August 1990 | IMAP v 2 | |||
| Path MTU Discovery | November 1990 | PMTUD | Obsoletes RFC 1063 | ||
| Network Time Protocol Specification, Implementation and Analysis | March 1992 | NTP v 3 | RFC 5905 | Obsoletes RFC 1119, RFC 1059, RFC 958 | |
| The MD5 Message-Digest Algorithm | April 1992 | MD5 | |||
| THE TFTP PROTOCOL | July 1992 | TFTP | Obsoletes RFC 783 | ||
| The Internet Gopher Protocol | March 1993 | Gopher | |||
| Introduction to version 2 of the Internet-standard Network Management Framework | April 1993 | SNMP v 2 | |||
| Internet Relay Chat Protocol | May 1993 | IRC | |||
| INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4 | December 1994 | IMAP v 4 | |||
| Lightweight Directory Access Protocol | March 1995 | LDAP | |||
| Netiquette Guidelines | October 1995 | Netiquette | |||
| Address Allocation for Private Internets | February 1996 | Private network | |||
| SOCKS Protocol Version 5 | March 1996 | SOCKS5 | |||
| Post Office Protocol - Version 3 | May 1996 | POP v 3 | |||
| Hypertext Transfer Protocol—HTTP/1.0 | May 1996 | HTTP v 1.0 | |||
| Defending Against Sequence Number Attacks | May 1996 | IP spoofing | |||
| ZLIB Compressed Data Format Specification version 3.3 | May 1996 | Zlib v 3.3 | |||
| DEFLATE Compressed Data Format Specification version 1.3 | May 1996 | DEFLATE v 1.3 | |||
| GZIP file format specification version 4.3 | May 1996 | Gzip v 4.3 | |||
| The Kerberos Version 5 GSS-API Mechanism | June 1996 | Kerberos; GSSAPI | |||
| RIPng for IPv6 | January 1997 | RIP v ng | |||
| Key words for use in RFCs to Indicate Requirement Levels | March 1997 | Request for Comments | Updated by RFC 8174 | ||
| Dynamic Host Configuration Protocol | March 1997 | DHCP | |||
| IMAP4 IDLE command | June 1997 | IMAP IDLE | |||
| IMAP/POP AUTHorize Extension for Simple Challenge/Response | September 1997 | CRAM-MD5 | |||
| FTP Security Extensions | October 1997 | FTP | |||
| Key Exchange Delegation Record for the DNS | November 1997 | Secure DNS | |||
| The TLS Protocol Version 1.0 | January 1999 | TLS 1.0 | |||
| Lightweight Directory Access Protocol | December 1997 | LDAP v 3 | |||
| Lightweight Directory Access Protocol : Attribute Syntax Definitions | December 1997 | LDAP v 3 | |||
| Lightweight Directory Access Protocol : UTF-8 String Representation of Distinguished Names | December 1997 | LDAP v 3 | |||
| The String Representation of LDAP Search Filters | December 1997 | LDAP v 3 | |||
| The LDAP URL Format | December 1997 | LDAP v 3 | |||
| A Summary of the X.500 User Schema for use with LDAPv3 | December 1997 | LDAP v 3 | |||
| Real Time Streaming Protocol | April 1998 | RTSP | |||
| SDP: Session Description Protocol | April 1998 | SDP | |||
| OSPF Version 2 | April 1998 | OSPF | |||
| Mapping of Airline Reservation, Ticketing, and Messaging Traffic over IP | May 1998 | MATIP | |||
| Protocol Independent Multicast-Sparse Mode | June 1998 | PIM | |||
| The "data" URL scheme | August 1998 | Data: URI scheme | |||
| Internet IP Security Domain of Interpretation for ISAKMP. | November 1998 | IKE | |||
| Internet Security Association and Key Management Protocol | November 1998 | IKE | |||
| The Internet Key Exchange | November 1998 | IKE | |||
| Multiprotocol Interconnect over Frame Relay | September 1998 | Frame Relay | 1294, 1490 | ||
| RIP Version 2 | November 1998 | RIP v 2 | |||
| Internet Protocol, Version 6 Specification | December 1998 | IPv6 | |||
| IP over Avian Carriers with Quality of Service | April 1, 1999 | IP over Avian Carriers | |||
| 30 Years of RFCs | April 7, 1999 | Retraces the history of RFCs | |||
| Introduction to Version 3 of the Internet-standard Network Management Framework | April 1999 | SNMP v3 | |||
| Using TLS with IMAP, POP3 and ACAP | June 1999 | STARTTLS for IMAP, POP3 and ACAP | |||
| Reserved Top Level DNS Names | June 1999 | Fictitious domain name | example.com,.test,... | ||
| OSPF for IPv6 | December 1999 | OSPF | |||
| Generic Security Service Application Program Interface Version 2, Update 1 | January 2000 | GSSAPI v 2 | |||
| Generic Security Service API Version 2 : C-bindings | January 2000 | GSSAPI v 2 | |||
| Internet Open Trading Protocol - IOTP Version 1.0 | April 2000 | Internet Open Trading Protocol | |||
| Digital Signatures for the v1.0 Internet Open Trading Protocol | April 2000 | Internet Open Trading Protocol | |||
| Internet Relay Chat: Architecture | April 2000 | IRC | |||
| Internet Relay Chat: Channel Management | April 2000 | IRC | |||
| Internet Relay Chat: Client Protocol | April 2000 | IRC | |||
| Internet Relay Chat: Server Protocol | April 2000 | IRC | |||
| Generic Security Service API Version 2 : Java Bindings | June 2000 | GSSAPI v 2 | |||
| Remote Authentication Dial In User Service | June 2000 | RADIUS | |||
| RADIUS Accounting | June 2000 | RADIUS | |||
| Internet Open Trading Protocol HTTP Supplement | September 2000 | Internet Open Trading Protocol | |||
| Session Announcement Protocol | October 2000 | SAP | |||
| Internet Open Trading Protocol, Version 1, Errata | March 2003 | Internet Open Trading Protocol | |||
| Traditional IP Network Address Translator | January 2001 | NAT | |||
| Multiprotocol Label Switching Architecture | January 2001 | MPLS | |||
| IPv6 Tunnel Broker | January 2001 | Tunnel Broker | |||
| Connection of IPv6 Domains via IPv4 Clouds | February 2001 | 6to4 | |||
| The Blocks Extensible Exchange Protocol Core | March 2001 | BEEP | |||
| RADIUS and IPv6 | August 2001 | RADIUS | |||
| SMTP Service Extension for Secure SMTP over Transport Layer Security | February 2002 | STARTTLS for SMTP | |||
| SIP: Session Initiation Protocol | June 2002 | SIP | |||
| The VCDIFF Generic Differencing and Compression Data Format | June 2002 | VCDIFF | |||
| An Introduction to the Stream Control Transmission Protocol | May 2002 | SCTP | |||
| Dynamic Host Configuration Protocol for IPv6 | July 2003 | DHCP | |||
| Date and Time on the Internet: Timestamps | July 2002 | Timestamp | |||
| Internet Group Management Protocol, Version 3 | October 2002 | IGMP v 3 | |||
| Dynamic Delegation Discovery System Part One: The Comprehensive DDDS | October 2002 | DDDS | |||
| Dynamic Delegation Discovery System Part Two: The Algorithm | October 2002 | DDDS | |||
| Dynamic Delegation Discovery System Part Three: The Domain Name System Database | October 2002 | DDDS | |||
| Dynamic Delegation Discovery System Part Four: The Uniform Resource Identifiers Resolution Application | October 2002 | DDDS | |||
| Dynamic Delegation Discovery System Part Five: URI.ARPA Assignment Procedures | October 2002 | DDDS | |||
| Punycode: A Bootstring encoding of Unicode for Internationalized Domain Names in Applications | March 2003 | Punycode | |||
| INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1 | March 2003 | IMAP v 4r1 | |||
| Network File System version 4 Protocol | April 2003 | NFS v 4 | RFC 7530 | ||
| Secure Electronic Transaction Supplement for the v1.0 Internet Open Trading Protocol | June 2003 | Internet Open Trading Protocol | |||
| RTP: A Transport Protocol for Real-Time Applications | July 2003 | RTP | |||
| The Secure Real-time Transport Protocol | March 2004 | SRTP | |||
| Internet Small Computer Systems Interface | April 2004 | ISCSI | |||
| Extensible Provisioning Protocol | March 2004 | Extensible Provisioning Protocol | |||
| Small Computer Systems Interface Command Ordering Considerations with iSCSI | May 2004 | ISCSI | |||
| Voice Profile for Internet Protocol | June 2004 | VPIM | |||
| MIKEY: Multimedia Internet KEYing | August 2004 | MIKEY | |||
| Payment Application Programmers Interface for v1.0 | November 2004 | Internet Open Trading Protocol | |||
| Network News Transfer Protocol | October 2006 | NNTP | |||
| The Kerberos Version 5 - Generic Security Service Application Program Interface | July 2005 | Kerberos | |||
| A Universally Unique IDentifier URN Namespace | July 2005 | UUID | |||
| The 'tag' URI Scheme | October 2005 | Tag URI scheme | |||
| Basic Transition Mechanisms for IPv6 Hosts and Routers | October 2005 | 6in4 | |||
| Securing FTP with TLS | October 2005 | SSL FTP (FTPS) | |||
| Border Gateway Protocol 4 | January 2006 | Border Gateway Protocol | |||
| The Atom Syndication Format | December 2005 | Atom | |||
| The Secure Shell Protocol Architecture | January 2006 | SSH-2 | |||
| IP Version 6 Addressing Architecture | February 2006 | IPv6 | |||
| A Framework for Conferencing with the Session Initiation Protocol | February 2006 | Conference call | |||
| Sender Policy Framework for Authorizing Use of Domains in E-Mail, Version 1 | January 2006 | SPF | |||
| Simple Authentication and Security Layer | June 2006 | SASL | |||
| Considerations for Internet Group Management Protocol and Multicast Listener Discovery Snooping Switches | May 2006 | IGMP snooping | |||
| A Session Initiation Protocol Event Package for Conference State | August 2006 | Conference call | |||
| Session Initiation Protocol Call Control - Conferencing for User Agents | August 2006 | Conference call | |||
| RFC 6234 | US Secure Hash Algorithms | July 2006 | SHA-1, SHA-2 | ||
| A Path Computation Element -Based Architecture | August 2008 | Path computation element | |||
| Network Address Translation Behavioral Requirements for Unicast UDP | January 2007 | NAT | |||
| Stream Control Transmission Protocol | September 2007 | SCTP | |||
| The Atom Publishing Protocol | October 2007 | Atom | |||
| Sieve: An Email Filtering Language | January 2008 | Sieve | Obsoletes RFC 3028 | ||
| Simple Mail Transfer Protocol | October 2008 | SMTP, Internet Message Format | |||
| Internet Message Format | October 2008 | SMTP, Internet Message Format | |||
| Shim6: Level 3 Multihoming Shim Protocol for IPv6 | June 2009 | Site Multihoming by IPv6 Intermediation | |||
| iCalendar Specification | September 2009 | iCalendar | |||
| Tags for Identifying Languages | September 2009 | language tags | |||
| The OAuth 1.0 Protocol | April 2010 | OAuth | |||
| Bidirectional Forwarding Detection | June 2010 | BFD | |||
| BFD for IPv4 and IPv6 | June 2010 | BFD | |||
| Network Time Protocol Version 4: Protocol and Algorithms Specification | June 2010 | NTP v 4 | Obsoletes RFC 1305, RFC 4330 | ||
| IPv6 Rapid Deployment on IPv4 Infrastructures | January 2010 | IPv6 rapid deployment | |||
| TOTP: Time-Based One-Time Password Algorithm | May 2011 | TOTP | |||
| HTTP State Management Mechanism | April 2011 | HTTP cookie | |||
| Message submission for mail | November 2011 | message submission agent | replaces 2476, 4409 | ||
| The WebSocket Protocol | December 2011 | WebSocket | |||
| Sakai-Kasahara Key Encryption | February 2012 | SAKKE | |||
| Definition of the Opus Audio Codec | September 2012 | Opus (audio format) | Updated by RFC 8251 | ||
| File Delivery over Unidirectional Transport | November 2012 | FLUTE | Obsoletes RFC 3926 | ||
| The OAuth 2.0 Authorization Framework | October 2012 | OAuth | |||
| HTTP Strict Transport Security | November 2012 | HTTP Strict Transport Security | |||
| The Application of the Path Computation Element Architecture to the Determination of a Sequence of Domains in MPLS and GMPLS | November 2012 | Path computation element | |||
| Hypertext Transfer Protocol : Message Syntax and Routing | June 2014 | HTTP v1.1 | Obsoletes 2616 | ||
| Hypertext Transfer Protocol : Semantics and Content | June 2014 | HTTP v1.1 | Obsoletes 2616 | ||
| Hypertext Transfer Protocol : Conditional Requests | June 2014 | HTTP v1.1 | Obsoletes 2616 | ||
| Hypertext Transfer Protocol : Range Requests | June 2014 | HTTP v1.1, Byte serving | Obsoletes 2616 | ||
| Hypertext Transfer Protocol : Caching | June 2014 | HTTP v1.1 | Obsoletes 2616 | ||
| Hypertext Transfer Protocol : Authentication | June 2014 | HTTP v1.1 | Obsoletes 2616 | ||
| Constrained Application Protocol | June 2014 | Constrained Application Protocol | |||
| Transport Layer Security : Application-Layer Protocol Negotiation Extension | July 2014 | Application-Layer Protocol Negotiation | |||
| Virtual eXtensible Local Area Network : A Framework for Overlaying Virtualized Layer 2 Networks over Layer 3 Networks | August 2014 | VXLAN | |||
| Public Key Pinning Extension for HTTP | April 2015 | HTTP Public Key Pinning | |||
| Network File System version 4 Protocol | March 2015 | NFS v 4 | |||
| Hypertext Transfer Protocol Version 2 | May 2015 | HTTP/2 | |||
| HPACK: Header Compression for HTTP/2 | May 2015 | HTTP/2 | |||
| IETF Recommendations Regarding Active Queue Management | July 2015 | Active Queue Management | |||
| An HTTP Status Code to Report Legal Obstacles | December 2015 | HTTP 451 | |||
| Client Subnet in DNS Queries | May 2016 | Domain Name System | |||
| XMSS: eXtended Merkle Signature Scheme | May 2018 | Hash-based cryptography | |||
| CBOR Web Token | May 2018 | ||||
| QUIC: A UDP-Based Multiplexed and Secure Transport | May 2021 | QUIC | |||
| Transmission Control Protocol | August 2022 | TCP | Obsoletes RFC 793 | ||
| CBOR Object Signing and Encryption : Countersignatures | December 2022 | COSE | Updates RFC 9052 | ||
| The Messaging Layer Security Protocol | July 2023 | Messaging Layer Security | |||
| JSONPath | February 2024 | JSONPath | |||
| OpenPGP | July 2024 | OpenPGP | Obsoletes RFC 4880, RFC 5581, RFC 6637 |
Topical list
Obsolete RFCs are indicated with| Topic | Related RFCs |
| Address Resolution Protocol | RFC 826 |
| Blocks Extensible Exchange Protocol | RFC 3080 |
| Bidirectional Forwarding Detection | RFC 5880, RFC 5881 |
| BOOTP | RFC 951 |
| CRAM-MD5 | RFC 2195 |
| Date and Time on the Internet | RFC 3339 |
| DEFLATE | RFC 1951 |
| DISCARD | RFC 863 |
| Domain Name System | RFC 1034, RFC 1035, RFC 2606, RFC 7871 |
| Dynamic Delegation Discovery System | |
| Dynamic Host Configuration Protocol | |
| Extensible Messaging and Presence Protocol | RFC 3920 RFC 3921 RFC 3922 |
| ECHO protocol | RFC 862 |
| Fictitious domain name | RFC 2606 |
| File Transfer Protocol | RFC 114, |
| Frame Relay | |
| Generic Security Services Application Program Interface | |
| gzip | RFC 1952 |
| HyperText Transfer Protocol | RFC 1945, |
| Internet Control Message Protocol | RFC 792 |
| Internet Group Management Protocol | |
| Internet Key Exchange | IKE RFC 2409, RFC 2407, RFC 2408, IKEv2 RFC 4306, IKEv2 RFC 4301, RFC 4310 |
| Internet Message Access Protocol | RFC 1176, RFC 1730, |
| Internet Protocol | see IPv4 and IPv6 |
| IP over Avian Carriers | RFC 1149, RFC 2549 |
| IPv4 | |
| IPv6 | |
| IPv6 addressing | |
| Internet Relay Chat | RFC 1459, RFC 2810, RFC 2811, RFC 2812, RFC 2813 |
| Internet Open Trading Protocol | RFC 2801, RFC 3504, RFC 2802, RFC 2935, RFC 3538, RFC 3867 |
| ISCSI | RFC 3720, RFC 3783 |
| Kerberos | RFC 1964 |
| Lightweight Directory Access Protocol | |
| Microsoft Point-to-Point Encryption | |
| MIKEY | RFC 3830, RFC 4650, RFC 4738, RFC 6043, RFC 6267, RFC 6509 |
| MD5 | RFC 1321 |
| Multiprotocol Label Switching | RFC 3031 |
| Multipurpose Internet Mail Extensions | RFC 2045 RFC 2046 RFC 2047 RFC 2049 |
| Network address translation | |
| Network File System | |
| Network News Transfer Protocol | |
| Network Time Protocol | RFC 1059, RFC 1119, RFC 1305, RFC 5905 |
| Open Shortest Path First | |
| Pretty Good Privacy | |
| Protocol Independent Multicast | |
| Reverse Address Resolution Protocol | RFC 903 |
| QUIC | RFC 9000 |
| Post Office Protocol | |
| RADIUS | |
| Real-time Transport Protocol | RFC 1889 |
| Real Time Streaming Protocol | RFC 2326 |
| Routing Information Protocol | RFC 1058, |
| Sender Policy Framework | RFC 4408 |
| Secure Shell-2 | RFC 4251 |
| Session Announcement Protocol | RFC 2974 |
| Session Description Protocol | RFC 2327 |
| Session Initiation Protocol | RFC 3261 |
| SHA hash functions | |
| Simple Authentication and Security Layer | |
| Simple Mail Transfer Protocol, Internet Message Format | |
| Simple Network Management Protocol | |
| Stream Control Transmission Protocol | |
| Tag URI scheme | RFC 4151 |
| TELNET | RFC 15, RFC 854, RFC 855 |
| Transmission Control Protocol | |
| Transport Layer Security 1.0 | RFC 2246 |
| Trivial File Transfer Protocol | |
| Usenet | |
| Uniform Resource Identifier | RFC 3986 |
| User Datagram Protocol | RFC 768 |
| UTF-8 | RFC 3629 |
| zlib | RFC 1950 |