| 768 | User Datagram ProtocolJ. Postel | Internet Standard | August 1980 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1337 | TIME-WAIT Assassination Hazards in TCPR. Braden | Informational | May 1992 |
| 1948 | Defending Against Sequence Number AttacksS. Bellovin · obsoleted by RFC 6528 | Informational | May 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2385 | Protection of BGP Sessions via the TCP MD5 Signature OptionA. Heffernan · obsoleted by RFC 5925 | Proposed Standard | August 1998 |
| 2663 | IP Network Address Translator (NAT) Terminology and ConsiderationsP. Srisuresh, M. Holdrege | Informational | August 1999 |
| 3550 | RTP: A Transport Protocol for Real-Time ApplicationsH. Schulzrinne, S. Casner, R. Frederick, V. Jacobson | Internet Standard | July 2003 |
| 3605 | Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)C. Huitema | Proposed Standard | October 2003 |
| 3828 | The Lightweight User Datagram Protocol (UDP-Lite)L-A. Larzon, M. Degermark, S. Pink, L-E. Jonsson, Ed., G. Fairhurst, Ed. | Proposed Standard | July 2004 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4340 | Datagram Congestion Control Protocol (DCCP)E. Kohler, M. Handley, S. Floyd | Proposed Standard | March 2006 |
| 4787 | Network Address Translation (NAT) Behavioral Requirements for Unicast UDPF. Audet, Ed., C. Jennings | Best Current Practice | January 2007 |
| 4953 | Defending TCP Against Spoofing AttacksJ. Touch | Informational | July 2007 |
| 4960 | Stream Control Transmission ProtocolR. Stewart, Ed. · obsoleted by RFC 9260 | Proposed Standard | September 2007 |
| 5382 | NAT Behavioral Requirements for TCPS. Guha, Ed., K. Biswas, B. Ford, S. Sivakumar, P. Srisuresh | Best Current Practice | October 2008 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5925 | The TCP Authentication OptionJ. Touch, A. Mankin, R. Bonica | Proposed Standard | June 2010 |
| 5927 | ICMP Attacks against TCPF. Gont | Informational | July 2010 |