| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 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 |
| 2818 | HTTP Over TLSE. Rescorla · obsoleted by RFC 9110 | Informational | May 2000 |
| 3023 | XML Media TypesM. Murata, S. St. Laurent, D. Kohn · obsoleted by RFC 7303 | Proposed Standard | January 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 |
| 3833 | Threat Analysis of the Domain Name System (DNS)D. Atkins, R. Austein | Informational | August 2004 |
| 3921 | Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and PresenceP. Saint-Andre, Ed. · obsoleted by RFC 6121 | Proposed Standard | October 2004 |
| 3958 | Domain-Based Application Service Location Using SRV RRs and the Dynamic Delegation Discovery Service (DDDS)L. Daigle, A. Newton | Proposed Standard | January 2005 |
| 3966 | The tel URI for Telephone NumbersH. Schulzrinne | Proposed Standard | December 2004 |
| 4033 | DNS Security Introduction and RequirementsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4119 | A Presence-based GEOPRIV Location Object FormatJ. Peterson | Proposed Standard | December 2005 |
| 4288 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin · obsoleted by RFC 6838 | Best Current Practice | December 2005 |
| 4848 | Domain-Based Application Service Location Using URIs and the Dynamic Delegation Discovery Service (DDDS)L. Daigle | Proposed Standard | April 2007 |
| 5012 | Requirements for Emergency Context Resolution with Internet TechnologiesH. Schulzrinne, R. Marshall, Ed. | Informational | January 2008 |
| 5031 | A Uniform Resource Name (URN) for Emergency and Other Well-Known ServicesH. Schulzrinne | Proposed Standard | January 2008 |
| 5069 | Security Threats and Requirements for Emergency Call Marking and MappingT. Taylor, Ed., H. Tschofenig, H. Schulzrinne, M. Shanmugam | Informational | January 2008 |
| 5139 | Revised Civic Location Format for Presence Information Data Format Location Object (PIDF-LO)M. Thomson, J. Winterbottom | Proposed Standard | February 2008 |
| 5223 | Discovering Location-to-Service Translation (LoST) Servers Using the Dynamic Host Configuration Protocol (DHCP)H. Schulzrinne, J. Polk, H. Tschofenig | Proposed Standard | August 2008 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |