| 20 | ASCII format for network interchangeV.G. Cerf | Internet Standard | October 1969 |
| 97 | First Cut at a Proposed Telnet ProtocolJ.T. Melvin, R.W. Watson | Unknown | February 1971 |
| 137 | Telnet Protocol - a proposed documentT.C. O'Sullivan | Unknown | April 1971 |
| 139 | Discussion of Telnet ProtocolT.C. O'Sullivan | Unknown | May 1971 |
| 318 | Telnet ProtocolsJ. Postel | Unknown | April 1972 |
| 542 | File Transfer ProtocolN. Neigus · obsoleted by RFC 765 | Unknown | August 1973 |
| 698 | Telnet extended ASCII optionT. Mock · obsoleted by RFC 5198 | Proposed Standard | July 1975 |
| 742 | NAME/FINGER ProtocolK. Harrenstien · obsoleted by RFC 1194, RFC 1196, RFC 1288 | Unknown | December 1977 |
| 854 | Telnet Protocol SpecificationJ. Postel, J.K. Reynolds | Internet Standard | May 1983 |
| 954 | NICNAME/WHOISK. Harrenstien, M.K. Stahl, E.J. Feinler · obsoleted by RFC 3912 | Draft Standard | October 1985 |
| 959 | File Transfer ProtocolJ. Postel, J. Reynolds | Internet Standard | October 1985 |
| 1945 | Hypertext Transfer Protocol -- HTTP/1.0T. Berners-Lee, R. Fielding, H. Frystyk | Informational | May 1996 |
| 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 |
| 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 |
| 2781 | UTF-16, an encoding of ISO 10646P. Hoffman, F. Yergeau | Informational | February 2000 |
| 2821 | Simple Mail Transfer ProtocolJ. Klensin, Ed. · obsoleted by RFC 5321 | Proposed Standard | April 2001 |
| 3454 | Preparation of Internationalized Strings ("stringprep")P. Hoffman, M. Blanchet · obsoleted by RFC 7564 | Proposed Standard | January 2003 |
| 3491 | Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)P. Hoffman, M. Blanchet · obsoleted by RFC 5891 | Proposed Standard | March 2003 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 3912 | WHOIS Protocol SpecificationL. Daigle | Draft Standard | September 2004 |
| 4251 | The Secure Shell (SSH) Protocol ArchitectureT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4690 | Review and Recommendations for Internationalized Domain Names (IDNs)J. Klensin, P. Faltstrom, C. Karp, IAB | Informational | September 2006 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |