| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGESD. Crocker · obsoleted by RFC 2822 | Internet Standard | August 1982 |
| 1263 | TCP Extensions Considered HarmfulS. O'Malley, L.L. Peterson | Informational | October 1991 |
| 1341 | MIME (Multipurpose Internet Mail Extensions): Mechanisms for Specifying and Describing the Format of Internet Message BodiesN. Borenstein, N. Freed · obsoleted by RFC 1521 | Proposed Standard | June 1992 |
| 1521 | MIME (Multipurpose Internet Mail Extensions) Part One: Mechanisms for Specifying and Describing the Format of Internet Message BodiesN. Borenstein, N. Freed · obsoleted by RFC 2045, RFC 2046, RFC 2047, RFC 2048, RFC 2049 | Draft Standard | September 1993 |
| 2058 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, A. Rubens, W. Simpson, S. Willens · obsoleted by RFC 2138 | Proposed Standard | January 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2132 | DHCP Options and BOOTP Vendor ExtensionsS. Alexander, R. Droms | Draft Standard | March 1997 |
| 2246 | The TLS Protocol Version 1.0T. Dierks, C. Allen · obsoleted by RFC 4346 | Historic | January 1999 |
| 2284 | PPP Extensible Authentication Protocol (EAP)L. Blunk, J. Vollbrecht · obsoleted by RFC 3748 | Proposed Standard | March 1998 |
| 2474 | Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 HeadersK. Nichols, S. Blake, F. Baker, D. Black | Proposed Standard | December 1998 |
| 2616 | Hypertext Transfer Protocol -- HTTP/1.1R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee · obsoleted by RFC 7230, RFC 7231, RFC 7232, RFC 7233, RFC 7234, RFC 7235 | Draft Standard | June 1999 |
| 2661 | Layer Two Tunneling Protocol "L2TP"W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter | Proposed Standard | August 1999 |
| 2671 | Extension Mechanisms for DNS (EDNS0)P. Vixie · obsoleted by RFC 6891 | Proposed Standard | August 1999 |
| 2822 | Internet Message FormatP. Resnick, Ed. · obsoleted by RFC 5322 | Proposed Standard | April 2001 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 2882 | Network Access Servers Requirements: Extended RADIUS PracticesD. Mitton | Informational | July 2000 |
| 3095 | RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressedC. Bormann, C. Burmeister, M. Degermark, H. Fukushima, H. Hannu, L-E. Jonsson, R. Hakenberg, T. Koren, K. Le, Z. Liu, A. Martensson, A. Miyazaki, K. Svanbro, T. Wiebke, T. Yoshimura, H. Zheng | Proposed Standard | July 2001 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3427 | Change Process for the Session Initiation Protocol (SIP)A. Mankin, S. Bradner, R. Mahy, D. Willis, J. Ott, B. Rosen · obsoleted by RFC 5727 | Best Current Practice | December 2002 |
| 3575 | IANA Considerations for RADIUS (Remote Authentication Dial In User Service)B. Aboba | Proposed Standard | July 2003 |
| 3588 | Diameter Base ProtocolP. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko · obsoleted by RFC 6733 | Proposed Standard | September 2003 |
| 3597 | Handling of Unknown DNS Resource Record (RR) TypesA. Gustafsson | Proposed Standard | September 2003 |
| 3692 | Assigning Experimental and Testing Numbers Considered UsefulT. Narten | Best Current Practice | January 2004 |
| 3735 | Guidelines for Extending the Extensible Provisioning Protocol (EPP)S. Hollenbeck | Informational | March 2004 |
| 3748 | Extensible Authentication Protocol (EAP)B. Aboba, L. Blunk, J. Vollbrecht, J. Carlson, H. Levkowetz, Ed. | Proposed Standard | June 2004 |
| 3935 | A Mission Statement for the IETFH. Alvestrand | Best Current Practice | October 2004 |
| 4001 | Textual Conventions for Internet Network AddressesM. Daniele, B. Haberman, S. Routhier, J. Schoenwaelder | Proposed Standard | March 2005 |
| 4181 | Guidelines for Authors and Reviewers of MIB DocumentsC. Heard, Ed. | Best Current Practice | September 2005 |
| 4366 | Transport Layer Security (TLS) ExtensionsS. Blake-Wilson, M. Nystrom, D. Hopwood, J. Mikkelsen, T. Wright · obsoleted by RFC 5246, RFC 6066 | Proposed Standard | April 2006 |
| 4485 | Guidelines for Authors of Extensions to the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne | Informational | May 2006 |
| 4521 | Considerations for Lightweight Directory Access Protocol (LDAP) ExtensionsK. Zeilenga | Best Current Practice | June 2006 |
| 4727 | Experimental Values In IPv4, IPv6, ICMPv4, ICMPv6, UDP, and TCP HeadersB. Fenner | Proposed Standard | November 2006 |
| 4775 | Procedures for Protocol Extensions and VariationsS. Bradner, B. Carpenter, Ed., T. Narten | Best Current Practice | December 2006 |
| 4929 | Change Process for Multiprotocol Label Switching (MPLS) and Generalized MPLS (GMPLS) Protocols and ProceduresL. Andersson, Ed., A. Farrel, Ed. | Best Current Practice | June 2007 |
| 4962 | Guidance for Authentication, Authorization, and Accounting (AAA) Key ManagementR. Housley, B. Aboba | Best Current Practice | July 2007 |
| 5080 | Common Remote Authentication Dial In User Service (RADIUS) Implementation Issues and Suggested FixesD. Nelson, A. DeKok | Proposed Standard | December 2007 |
| 5201 | Host Identity ProtocolR. Moskowitz, P. Nikander, P. Jokela, Ed., T. Henderson · obsoleted by RFC 7401 | Experimental | April 2008 |
| 5218 | What Makes for a Successful Protocol?D. Thaler, B. Aboba | Informational | July 2008 |
| 5225 | RObust Header Compression Version 2 (ROHCv2): Profiles for RTP, UDP, IP, ESP and UDP-LiteG. Pelletier, K. Sandlund | Proposed Standard | April 2008 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5405 | Unicast UDP Usage Guidelines for Application DesignersL. Eggert, G. Fairhurst · obsoleted by RFC 8085 | Best Current Practice | November 2008 |
| 5421 | Basic Password Exchange within the Flexible Authentication via Secure Tunneling Extensible Authentication Protocol (EAP-FAST)N. Cam-Winget, H. Zhou | Informational | March 2009 |
| 5422 | Dynamic Provisioning Using Flexible Authentication via Secure Tunneling Extensible Authentication Protocol (EAP-FAST)N. Cam-Winget, D. McGrew, J. Salowey, H. Zhou | Informational | March 2009 |
| 5704 | Uncoordinated Protocol Development Considered HarmfulS. Bryant, Ed., M. Morrow, Ed., IAB | Informational | November 2009 |
| 5727 | Change Process for the Session Initiation Protocol (SIP) and the Real-time Applications and Infrastructure AreaJ. Peterson, C. Jennings, R. Sparks | Best Current Practice | March 2010 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5996 | Internet Key Exchange Protocol Version 2 (IKEv2)C. Kaufman, P. Hoffman, Y. Nir, P. Eronen · obsoleted by RFC 7296 | Proposed Standard | September 2010 |
| 6055 | IAB Thoughts on Encodings for Internationalized Domain NamesD. Thaler, J. Klensin, S. Cheshire | Informational | February 2011 |
| 6158 | RADIUS Design GuidelinesA. DeKok, Ed., G. Weber | Best Current Practice | March 2011 |
| 6648 | Deprecating the "X-" Prefix and Similar Constructs in Application ProtocolsP. Saint-Andre, D. Crocker, M. Nottingham | Best Current Practice | June 2012 |