| 2367 | PF_KEY Key Management API, Version 2D. McDonald, C. Metz, B. Phan | Informational | July 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2409 | The Internet Key Exchange (IKE)D. Harkins, D. Carrel · obsoleted by RFC 4306 | Historic | November 1998 |
| 2461 | Neighbor Discovery for IP Version 6 (IPv6)T. Narten, E. Nordmark, W. Simpson · obsoleted by RFC 4861 | Draft Standard | December 1998 |
| 2462 | IPv6 Stateless Address AutoconfigurationS. Thomson, T. Narten · obsoleted by RFC 4862 | Draft Standard | December 1998 |
| 2960 | Stream Control Transmission ProtocolR. Stewart, Q. Xie, K. Morneault, C. Sharp, H. Schwarzbauer, T. Taylor, I. Rytina, M. Kalla, L. Zhang, V. Paxson · obsoleted by RFC 4960 | Proposed Standard | October 2000 |
| 3303 | Middlebox communication architecture and frameworkP. Srisuresh, J. Kuthan, J. Rosenberg, A. Molitor, A. Rayhan | Informational | August 2002 |
| 3424 | IAB Considerations for UNilateral Self-Address Fixing (UNSAF) Across Network Address TranslationL. Daigle, Ed., IAB | Informational | November 2002 |
| 3554 | On the Use of Stream Control Transmission Protocol (SCTP) with IPsecS. Bellovin, J. Ioannidis, A. Keromytis, R. Stewart | Proposed Standard | July 2003 |
| 3753 | Mobility Related TerminologyJ. Manner, Ed., M. Kojo, Ed. | Informational | June 2004 |
| 3775 | Mobility Support in IPv6D. Johnson, C. Perkins, J. Arkko · obsoleted by RFC 6275 | Proposed Standard | June 2004 |
| 4193 | Unique Local IPv6 Unicast AddressesR. Hinden, B. Haberman | Proposed Standard | October 2005 |
| 4225 | Mobile IP Version 6 Route Optimization Security Design BackgroundP. Nikander, J. Arkko, T. Aura, G. Montenegro, E. Nordmark | Informational | December 2005 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4306 | Internet Key Exchange (IKEv2) ProtocolC. Kaufman, Ed. · obsoleted by RFC 5996 | Proposed Standard | December 2005 |
| 4429 | Optimistic Duplicate Address Detection (DAD) for IPv6N. Moore | Proposed Standard | April 2006 |
| 4555 | IKEv2 Mobility and Multihoming Protocol (MOBIKE)P. Eronen | Proposed Standard | June 2006 |