| 821 | Simple Mail Transfer ProtocolJ. Postel · obsoleted by RFC 2821 | Internet Standard | August 1982 |
| 959 | File Transfer ProtocolJ. Postel, J. Reynolds | Internet Standard | October 1985 |
| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 1918 | Address Allocation for Private InternetsY. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear | Best Current Practice | February 1996 |
| 2101 | IPv4 Address Behaviour TodayB. Carpenter, J. Crowcroft, Y. Rekhter | Informational | February 1997 |
| 2205 | Resource ReSerVation Protocol (RSVP) -- Version 1 Functional SpecificationR. Braden, Ed., L. Zhang, S. Berson, S. Herzog, S. Jamin | Proposed Standard | September 1997 |
| 2327 | SDP: Session Description ProtocolM. Handley, V. Jacobson · obsoleted by RFC 4566 | Proposed Standard | April 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2402 | IP Authentication HeaderS. Kent, R. Atkinson · obsoleted by RFC 4302, RFC 4305 | Proposed Standard | November 1998 |
| 2406 | IP Encapsulating Security Payload (ESP)S. Kent, R. Atkinson · obsoleted by RFC 4303, RFC 4305 | Proposed Standard | November 1998 |
| 2411 | IP Security Document RoadmapR. Thayer, N. Doraswamy, R. Glenn · obsoleted by RFC 6071 | Informational | November 1998 |
| 2428 | FTP Extensions for IPv6 and NATsM. Allman, S. Ostermann, C. Metz | Proposed Standard | September 1998 |
| 2543 | SIP: Session Initiation ProtocolM. Handley, H. Schulzrinne, E. Schooler, J. Rosenberg · obsoleted by RFC 3261, RFC 3262, RFC 3263, RFC 3264, RFC 3265 | Proposed Standard | March 1999 |
| 2573 | SNMP ApplicationsD. Levi, P. Meyer, B. Stewart · obsoleted by RFC 3413 | Draft Standard | April 1999 |
| 2694 | DNS extensions to Network Address Translators (DNS_ALG)P. Srisuresh, G. Tsirtsis, P. Akkiraju, A. Heffernan | Informational | September 1999 |
| 2709 | Security Model with Tunnel-mode IPsec for NAT DomainsP. Srisuresh | Informational | October 1999 |
| 2962 | An SNMP Application Level Gateway for Payload Address TranslationD. Raz, J. Schoenwaelder, B. Sugla | Informational | October 2000 |
| 2993 | Architectural Implications of NATT. Hain | Informational | November 2000 |
| 3022 | Traditional IP Network Address Translator (Traditional NAT)P. Srisuresh, K. Egevang | Informational | January 2001 |