| 768 | User Datagram ProtocolJ. Postel | Internet Standard | August 1980 |
| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 1918 | Address Allocation for Private InternetsY. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear | Best Current Practice | February 1996 |
| 2101 | IPv4 Address Behaviour TodayB. Carpenter, J. Crowcroft, Y. Rekhter | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2617 | HTTP Authentication: Basic and Digest Access AuthenticationJ. Franks, P. Hallam-Baker, J. Hostetler, S. Lawrence, P. Leach, A. Luotonen, L. Stewart · obsoleted by RFC 7235, RFC 7615, RFC 7616, RFC 7617 | Draft Standard | June 1999 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 3315 | Dynamic Host Configuration Protocol for IPv6 (DHCPv6)R. Droms, Ed., J. Bound, B. Volz, T. Lemon, C. Perkins, M. Carney · obsoleted by RFC 8415 | 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 |
| 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 |
| 3825 | Dynamic Host Configuration Protocol Option for Coordinate-based Location Configuration InformationJ. Polk, J. Schnizlein, M. Linsner · obsoleted by RFC 6225 | Proposed Standard | July 2004 |
| 3966 | The tel URI for Telephone NumbersH. Schulzrinne | Proposed Standard | December 2004 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4282 | The Network Access IdentifierB. Aboba, M. Beadles, J. Arkko, P. Eronen · obsoleted by RFC 7542 | Proposed Standard | December 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4340 | Datagram Congestion Control Protocol (DCCP)E. Kohler, M. Handley, S. Floyd | Proposed Standard | March 2006 |
| 4361 | Node-specific Client Identifiers for Dynamic Host Configuration Protocol Version Four (DHCPv4)T. Lemon, B. Sommerfeld | Proposed Standard | February 2006 |
| 4745 | Common Policy: A Document Format for Expressing Privacy PreferencesH. Schulzrinne, H. Tschofenig, J. Morris, J. Cuellar, J. Polk, J. Rosenberg | Proposed Standard | February 2007 |
| 4776 | Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration InformationH. Schulzrinne | Proposed Standard | November 2006 |
| 4825 | The Extensible Markup Language (XML) Configuration Access Protocol (XCAP)J. Rosenberg | Proposed Standard | May 2007 |
| 4960 | Stream Control Transmission ProtocolR. Stewart, Ed. · obsoleted by RFC 9260 | Proposed Standard | September 2007 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5687 | GEOPRIV Layer 7 Location Configuration Protocol: Problem Statement and RequirementsH. Tschofenig, H. Schulzrinne | Informational | March 2010 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 5952 | A Recommendation for IPv6 Address Text RepresentationS. Kawamura, M. Kawashima | Proposed Standard | August 2010 |
| 5985 | HTTP-Enabled Location Delivery (HELD)M. Barnes, Ed. | Proposed Standard | September 2010 |