| 768 | User Datagram ProtocolJ. Postel | Internet Standard | August 1980 |
| 1191 | Path MTU discoveryJ. Mogul, S. Deering | Draft Standard | November 1990 |
| 1958 | Architectural Principles of the InternetB. Carpenter, Ed. | Informational | June 1996 |
| 1981 | Path MTU Discovery for IP version 6J. McCann, S. Deering, J. Mogul · obsoleted by RFC 8201 | Draft Standard | August 1996 |
| 2022 | Support for Multicast over UNI 3.0/3.1 based ATM NetworksG. Armitage | Proposed Standard | November 1996 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | 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 |
| 2661 | Layer Two Tunneling Protocol "L2TP"W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter | Proposed Standard | August 1999 |
| 2784 | Generic Routing Encapsulation (GRE)D. Farinacci, T. Li, S. Hanks, D. Meyer, P. Traina | Proposed Standard | March 2000 |
| 2890 | Key and Sequence Number Extensions to GREG. Dommety | Proposed Standard | September 2000 |
| 3022 | Traditional IP Network Address Translator (Traditional NAT)P. Srisuresh, K. Egevang | Informational | January 2001 |
| 3032 | MPLS Label Stack EncodingE. Rosen, D. Tappan, G. Fedorkow, Y. Rekhter, D. Farinacci, T. Li, A. Conta | Proposed Standard | January 2001 |
| 3448 | TCP Friendly Rate Control (TFRC): Protocol SpecificationM. Handley, S. Floyd, J. Padhye, J. Widmer · obsoleted by RFC 5348 | Proposed Standard | January 2003 |
| 3550 | RTP: A Transport Protocol for Real-Time ApplicationsH. Schulzrinne, S. Casner, R. Frederick, V. Jacobson | Internet Standard | July 2003 |
| 3592 | Definitions of Managed Objects for the Synchronous Optical Network/Synchronous Digital Hierarchy (SONET/SDH) Interface TypeK. Tesink | Draft Standard | September 2003 |
| 3768 | Virtual Router Redundancy Protocol (VRRP)R. Hinden, Ed. · obsoleted by RFC 5798 | Draft Standard | April 2004 |
| 3812 | Multiprotocol Label Switching (MPLS) Traffic Engineering (TE) Management Information Base (MIB)C. Srinivasan, A. Viswanathan, T. Nadeau | Proposed Standard | June 2004 |
| 3813 | Multiprotocol Label Switching (MPLS) Label Switching Router (LSR) Management Information Base (MIB)C. Srinivasan, A. Viswanathan, T. Nadeau | Proposed Standard | June 2004 |
| 3815 | Definitions of Managed Objects for the Multiprotocol Label Switching (MPLS), Label Distribution Protocol (LDP)J. Cucchiara, H. Sjostrand, J. Luciani | Proposed Standard | June 2004 |
| 3916 | Requirements for Pseudo-Wire Emulation Edge-to-Edge (PWE3)X. Xiao, Ed., D. McPherson, Ed., P. Pate, Ed. | Informational | October 2004 |
| 3931 | Layer Two Tunneling Protocol - Version 3 (L2TPv3)J. Lau, Ed., M. Townsley, Ed., I. Goyret, Ed. | Proposed Standard | March 2005 |