| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2781 | UTF-16, an encoding of ISO 10646P. Hoffman, F. Yergeau | Informational | February 2000 |
| 2818 | HTTP Over TLSE. Rescorla · obsoleted by RFC 9110 | Informational | May 2000 |
| 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 |
| 3982 | IRIS: A Domain Registry (dreg) Type for the Internet Registry Information Service (IRIS)A. Newton, M. Sanz | Proposed Standard | January 2005 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4180 | Common Format and MIME Type for Comma-Separated Values (CSV) FilesY. Shafranovich | Informational | October 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4519 | Lightweight Directory Access Protocol (LDAP): Schema for User ApplicationsA. Sciberras, Ed. | Proposed Standard | June 2006 |
| 5070 | The Incident Object Description Exchange FormatR. Danyliw, J. Meijer, Y. Demchenko · obsoleted by RFC 7970 | Proposed Standard | December 2007 |
| 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 |
| 5322 | Internet Message FormatP. Resnick, Ed. | Draft Standard | October 2008 |
| 5646 | Tags for Identifying LanguagesA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2009 |
| 5901 | Extensions to the IODEF-Document Class for Reporting PhishingP. Cain, D. Jevans | Proposed Standard | July 2010 |
| 5952 | A Recommendation for IPv6 Address Text RepresentationS. Kawamura, M. Kawashima | Proposed Standard | August 2010 |
| 6531 | SMTP Extension for Internationalized EmailJ. Yao, W. Mao | Proposed Standard | February 2012 |
| 6545 | Real-time Inter-network Defense (RID)K. Moriarty | Proposed Standard | April 2012 |
| 6546 | Transport of Real-time Inter-network Defense (RID) Messages over HTTP/TLSB. Trammell | Proposed Standard | April 2012 |
| 6685 | Expert Review for Incident Object Description Exchange Format (IODEF) Extensions in IANA XML RegistryB. Trammell · obsoleted by RFC 7970 | Proposed Standard | July 2012 |
| 7203 | An Incident Object Description Exchange Format (IODEF) Extension for Structured Cybersecurity InformationT. Takahashi, K. Landfield, Y. Kadobayashi | Proposed Standard | April 2014 |
| 7495 | Enumeration Reference Format for the Incident Object Description Exchange Format (IODEF)A. Montville, D. Black | Proposed Standard | March 2015 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |