| 768 | User Datagram ProtocolJ. Postel | Internet Standard | August 1980 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 813 | Window and Acknowledgement Strategy in TCPD.D. Clark · obsoleted by RFC 7805 | Historic | July 1982 |
| 1122 | Requirements for Internet Hosts - Communication LayersR. Braden, Ed. | Internet Standard | October 1989 |
| 1123 | Requirements for Internet Hosts - Application and SupportR. Braden, Ed. | Internet Standard | October 1989 |
| 1191 | Path MTU discoveryJ. Mogul, S. Deering | Draft Standard | November 1990 |
| 1858 | Security Considerations for IP Fragment FilteringG. Ziemba, D. Reed, P. Traina | Informational | October 1995 |
| 1981 | Path MTU Discovery for IP version 6J. McCann, S. Deering, J. Mogul · obsoleted by RFC 8201 | Draft Standard | August 1996 |
| 1982 | Serial Number ArithmeticR. Elz, R. Bush | Proposed Standard | August 1996 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2196 | Site Security HandbookB. Fraser | Informational | September 1997 |
| 2434 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 5226 | Best Current Practice | October 1998 |
| 2460 | Internet Protocol, Version 6 (IPv6) SpecificationS. Deering, R. Hinden · obsoleted by RFC 8200 | Draft Standard | December 1998 |
| 2522 | Photuris: Session-Key Management ProtocolP. Karn, W. Simpson | Experimental | March 1999 |
| 2581 | TCP Congestion ControlM. Allman, V. Paxson, W. Stevens · obsoleted by RFC 5681 | Proposed Standard | April 1999 |
| 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 |
| 3168 | The Addition of Explicit Congestion Notification (ECN) to IPK. Ramakrishnan, S. Floyd, D. Black | Proposed Standard | September 2001 |
| 3309 | Stream Control Transmission Protocol (SCTP) Checksum ChangeJ. Stone, R. Stewart, D. Otis · obsoleted by RFC 4960 | Proposed Standard | September 2002 |
| 3873 | Stream Control Transmission Protocol (SCTP) Management Information Base (MIB)J. Pastor, M. Belinchon | Proposed Standard | September 2004 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4303 | IP Encapsulating Security Payload (ESP)S. Kent | Proposed Standard | December 2005 |
| 4306 | Internet Key Exchange (IKEv2) ProtocolC. Kaufman, Ed. · obsoleted by RFC 5996 | Proposed Standard | December 2005 |
| 4460 | Stream Control Transmission Protocol (SCTP) Specification Errata and IssuesR. Stewart, I. Arias-Rodriguez, K. Poon, A. Caro, M. Tuexen · obsoleted by RFC 9260 | Informational | April 2006 |
| 4821 | Packetization Layer Path MTU DiscoveryM. Mathis, J. Heffner | Proposed Standard | March 2007 |
| 4895 | Authenticated Chunks for the Stream Control Transmission Protocol (SCTP)M. Tuexen, R. Stewart, P. Lei, E. Rescorla | Proposed Standard | August 2007 |