| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 3948 | UDP Encapsulation of IPsec ESP PacketsA. Huttunen, B. Swander, V. Volpe, L. DiBurro, M. Stenberg | Proposed Standard | January 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4423 | Host Identity Protocol (HIP) ArchitectureR. Moskowitz, P. Nikander · obsoleted by RFC 9063 | Informational | May 2006 |
| 4787 | Network Address Translation (NAT) Behavioral Requirements for Unicast UDPF. Audet, Ed., C. Jennings | Best Current Practice | January 2007 |
| 5128 | State of Peer-to-Peer (P2P) Communication across Network Address Translators (NATs)P. Srisuresh, B. Ford, D. Kegel | Informational | March 2008 |
| 5201 | Host Identity ProtocolR. Moskowitz, P. Nikander, P. Jokela, Ed., T. Henderson · obsoleted by RFC 7401 | Experimental | April 2008 |
| 5202 | Using the Encapsulating Security Payload (ESP) Transport Format with the Host Identity Protocol (HIP)P. Jokela, R. Moskowitz, P. Nikander · obsoleted by RFC 7402 | Experimental | April 2008 |
| 5203 | Host Identity Protocol (HIP) Registration ExtensionJ. Laganier, T. Koponen, L. Eggert · obsoleted by RFC 8003 | Experimental | April 2008 |
| 5204 | Host Identity Protocol (HIP) Rendezvous ExtensionJ. Laganier, L. Eggert · obsoleted by RFC 8004 | Experimental | April 2008 |
| 5206 | End-Host Mobility and Multihoming with the Host Identity ProtocolP. Nikander, T. Henderson, Ed., C. Vogt, J. Arkko · obsoleted by RFC 8046 | Experimental | April 2008 |
| 5207 | NAT and Firewall Traversal Issues of Host Identity Protocol (HIP) CommunicationM. Stiemerling, J. Quittek, L. Eggert | Informational | April 2008 |
| 5226 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 8126 | Best Current Practice | May 2008 |
| 5245 | Interactive Connectivity Establishment (ICE): A Protocol for Network Address Translator (NAT) Traversal for Offer/Answer ProtocolsJ. Rosenberg · obsoleted by RFC 8445, RFC 8839 | Proposed Standard | April 2010 |
| 5389 | Session Traversal Utilities for NAT (STUN)J. Rosenberg, R. Mahy, P. Matthews, D. Wing · obsoleted by RFC 8489 | Proposed Standard | October 2008 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5766 | Traversal Using Relays around NAT (TURN): Relay Extensions to Session Traversal Utilities for NAT (STUN)R. Mahy, P. Matthews, J. Rosenberg · obsoleted by RFC 8656 | Proposed Standard | April 2010 |