| 1234 | Tunneling IPX traffic through IP networksD. Provan | Historic | June 1991 |
| 1241 | Scheme for an internet encapsulation protocol: Version 1R.A. Woodburn, D.L. Mills | Experimental | July 1991 |
| 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 |
| 2004 | Minimal Encapsulation within IPC. Perkins | Proposed Standard | October 1996 |
| 2107 | Ascend Tunnel Management Protocol - ATMPK. Hamzeh | Informational | February 1997 |
| 2341 | Cisco Layer Two Forwarding (Protocol) "L2F"A. Valencia, M. Littlewood, T. Kolar | Historic | May 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2473 | Generic Packet Tunneling in IPv6 SpecificationA. Conta, S. Deering | Proposed Standard | December 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 |
| 2578 | Structure of Management Information Version 2 (SMIv2)K. McCloghrie, Ed., D. Perkins, Ed., J. Schoenwaelder, Ed. | Internet Standard | April 1999 |
| 2579 | Textual Conventions for SMIv2K. McCloghrie, Ed., D. Perkins, Ed., J. Schoenwaelder, Ed. | Internet Standard | April 1999 |
| 2580 | Conformance Statements for SMIv2K. McCloghrie, Ed., D. Perkins, Ed., J. Schoenwaelder, Ed. | Internet 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 |
| 2667 | IP Tunnel MIBD. Thaler · obsoleted by RFC 4087 | Proposed Standard | August 1999 |
| 2863 | The Interfaces Group MIBK. McCloghrie, F. Kastenholz | Draft Standard | June 2000 |
| 2893 | Transition Mechanisms for IPv6 Hosts and RoutersR. Gilligan, E. Nordmark · obsoleted by RFC 4213 | Proposed Standard | August 2000 |
| 3410 | Introduction and Applicability Statements for Internet-Standard Management FrameworkJ. Case, R. Mundy, D. Partain, B. Stewart | Informational | December 2002 |
| 3595 | Textual Conventions for IPv6 Flow LabelB. Wijnen | Proposed Standard | September 2003 |
| 4001 | Textual Conventions for Internet Network AddressesM. Daniele, B. Haberman, S. Routhier, J. Schoenwaelder | Proposed Standard | March 2005 |