| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 1122 | Requirements for Internet Hosts - Communication LayersR. Braden, Ed. | Internet Standard | October 1989 |
| 1141 | Incremental updating of the Internet checksumT. Mallory, A. Kullberg | Informational | January 1990 |
| 1349 | Type of Service in the Internet Protocol SuiteP. Almquist · obsoleted by RFC 2474 | Proposed Standard | July 1992 |
| 1455 | Physical Link Security Type of ServiceD. Eastlake 3rd · obsoleted by RFC 2474 | Experimental | May 1993 |
| 1701 | Generic Routing Encapsulation (GRE)S. Hanks, T. Li, D. Farinacci, P. Traina | Informational | October 1994 |
| 1702 | Generic Routing Encapsulation over IPv4 networksS. Hanks, T. Li, D. Farinacci, P. Traina | Informational | October 1994 |
| 2003 | IP Encapsulation within IPC. Perkins | Proposed Standard | October 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2309 | Recommendations on Queue Management and Congestion Avoidance in the InternetB. Braden, D. Clark, J. Crowcroft, B. Davie, S. Deering, D. Estrin, S. Floyd, V. Jacobson, G. Minshall, C. Partridge, L. Peterson, K. Ramakrishnan, S. Shenker, J. Wroclawski, L. Zhang · obsoleted by RFC 7567 | Informational | 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 |
| 2407 | The Internet IP Security Domain of Interpretation for ISAKMPD. Piper · obsoleted by RFC 4306 | Historic | November 1998 |
| 2408 | Internet Security Association and Key Management Protocol (ISAKMP)D. Maughan, M. Schertler, M. Schneider, J. Turner · obsoleted by RFC 4306 | Historic | November 1998 |
| 2409 | The Internet Key Exchange (IKE)D. Harkins, D. Carrel · obsoleted by RFC 4306 | Historic | November 1998 |
| 2474 | Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 HeadersK. Nichols, S. Blake, F. Baker, D. Black | Proposed Standard | December 1998 |
| 2475 | An Architecture for Differentiated ServicesS. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss | Informational | December 1998 |
| 2481 | A Proposal to add Explicit Congestion Notification (ECN) to IPK. Ramakrishnan, S. Floyd · obsoleted by RFC 3168 | Experimental | January 1999 |
| 2581 | TCP Congestion ControlM. Allman, V. Paxson, W. Stevens · obsoleted by RFC 5681 | Proposed Standard | April 1999 |
| 2637 | Point-to-Point Tunneling Protocol (PPTP)K. Hamzeh, G. Pall, W. Verthein, J. Taarud, W. Little, G. Zorn | Informational | July 1999 |
| 2661 | Layer Two Tunneling Protocol "L2TP"W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter | Proposed Standard | August 1999 |
| 2702 | Requirements for Traffic Engineering Over MPLSD. Awduche, J. Malcolm, J. Agogbua, M. O'Dell, J. McManus | Informational | September 1999 |
| 2780 | IANA Allocation Guidelines For Values In the Internet Protocol and Related HeadersS. Bradner, V. Paxson | Best Current Practice | March 2000 |
| 2884 | Performance Evaluation of Explicit Congestion Notification (ECN) in IP NetworksJ. Hadi Salim, U. Ahmed | Informational | July 2000 |
| 2983 | Differentiated Services and TunnelsD. Black | Informational | October 2000 |