| 2069 | An Extension to HTTP : Digest Access AuthenticationJ. Franks, P. Hallam-Baker, J. Hostetler, P. Leach, A. Luotonen, E. Sink, L. Stewart · obsoleted by RFC 2617 | Proposed Standard | January 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2277 | IETF Policy on Character Sets and LanguagesH. Alvestrand | Best Current Practice | January 1998 |
| 2781 | UTF-16, an encoding of ISO 10646P. Hoffman, F. Yergeau | Informational | February 2000 |
| 2827 | Network Ingress Filtering: Defeating Denial of Service Attacks which employ IP Source Address SpoofingP. Ferguson, D. Senie | Best Current Practice | May 2000 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3403 | Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) DatabaseM. Mealling | Proposed Standard | October 2002 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 3688 | The IETF XML RegistryM. Mealling | Best Current Practice | January 2004 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4725 | ENUM Validation ArchitectureA. Mayrhofer, B. Hoeneisen | Informational | November 2006 |
| 4732 | Internet Denial-of-Service ConsiderationsM. Handley, Ed., E. Rescorla, Ed., IAB | Informational | December 2006 |
| 4949 | Internet Security Glossary, Version 2R. Shirey | Informational | August 2007 |
| 5067 | Infrastructure ENUM RequirementsS. Lind, P. Pfautz | Informational | November 2007 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5486 | Session Peering for Multimedia Interconnect (SPEERMINT) TerminologyD. Malas, Ed., D. Meyer, Ed. | Informational | March 2009 |
| 5646 | Tags for Identifying LanguagesA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2009 |
| 6116 | The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application (ENUM)S. Bradner, L. Conroy, K. Fujiwara | Proposed Standard | March 2011 |
| 6461 | Data for Reachability of Inter-/Intra-NetworK SIP (DRINKS) Use Cases and Protocol RequirementsS. Channabasappa, Ed. | Informational | January 2012 |
| 7230 | Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and RoutingR. Fielding, Ed., J. Reschke, Ed. · obsoleted by RFC 9110, RFC 9112 | Proposed Standard | June 2014 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 7878 | Session Peering Provisioning (SPP) Protocol over SOAPK. Cartwright, V. Bhatia, J-F. Mule, A. Mayrhofer | Proposed Standard | August 2016 |