| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2141 | URN SyntaxR. Moats · obsoleted by RFC 8141 | Proposed Standard | May 1997 |
| 3043 | The Network Solutions Personal Internet Name (PIN): A URN Namespace for People and OrganizationsM. Mealling | Informational | January 2001 |
| 3044 | Using The ISSN (International Serial Standard Number) as URN (Uniform Resource Names) within an ISSN-URN NamespaceS. Rozenfeld · obsoleted by RFC 8254 | Historic | January 2001 |
| 3120 | A URN Namespace for XML.orgK. Best, N. Walsh | Informational | June 2001 |
| 3187 | Using International Standard Book Numbers as Uniform Resource NamesJ. Hakala, H. Walravens · obsoleted by RFC 8254 | Historic | October 2001 |
| 3188 | Using National Bibliography Numbers as Uniform Resource NamesJ. Hakala · obsoleted by RFC 8458 | Informational | October 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 |
| 3406 | Uniform Resource Names (URN) Namespace Definition MechanismsL. Daigle, D. van Gulik, R. Iannella, P. Faltstrom · obsoleted by RFC 8141 | Best Current Practice | October 2002 |
| 4152 | A Uniform Resource Name (URN) Namespace for the Common Language Equipment Identifier (CLEI) CodeK. Tesink, R. Fox | Informational | August 2005 |
| 4179 | Using Universal Content Identifier (UCI) as Uniform Resource Names (URN)S. Kang | Informational | October 2005 |
| 4195 | A Uniform Resource Name (URN) Namespace for the TV-Anytime ForumW. Kameyama | Informational | October 2005 |
| 4198 | A Uniform Resource Name (URN) Namespace for Federated ContentD. Tessman | Informational | November 2005 |
| 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 |
| 5589 | Session Initiation Protocol (SIP) Call Control - TransferR. Sparks, A. Johnston, Ed., D. Petrie | Best Current Practice | June 2009 |
| 5630 | The Use of the SIPS URI Scheme in the Session Initiation Protocol (SIP)F. Audet | Proposed Standard | October 2009 |
| 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 |
| 6365 | Terminology Used in Internationalization in the IETFP. Hoffman, J. Klensin | Best Current Practice | September 2011 |
| 6910 | Completion of Calls for the Session Initiation Protocol (SIP)D. Worley, M. Huelsemann, R. Jesske, D. Alexeitsev | Proposed Standard | April 2013 |
| 7463 | Shared Appearances of a Session Initiation Protocol (SIP) Address of Record (AOR)A. Johnston, Ed., M. Soroushnejad, Ed., V. Venkataramanan | Proposed Standard | March 2015 |