| 854 | Telnet Protocol SpecificationJ. Postel, J.K. Reynolds | Internet Standard | May 1983 |
| 1918 | Address Allocation for Private InternetsY. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear | Best Current Practice | February 1996 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2246 | The TLS Protocol Version 1.0T. Dierks, C. Allen · obsoleted by RFC 4346 | Historic | January 1999 |
| 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 |
| 2411 | IP Security Document RoadmapR. Thayer, N. Doraswamy, R. Glenn · obsoleted by RFC 6071 | Informational | November 1998 |
| 2661 | Layer Two Tunneling Protocol "L2TP"W. Townsley, A. Valencia, A. Rubens, G. Pall, G. Zorn, B. Palter | Proposed Standard | August 1999 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 3174 | US Secure Hash Algorithm 1 (SHA1)D. Eastlake 3rd, P. Jones | Informational | September 2001 |
| 3412 | Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)J. Case, D. Harrington, R. Presuhn, B. Wijnen | Internet Standard | December 2002 |
| 3414 | User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)U. Blumenthal, B. Wijnen | Internet Standard | December 2002 |
| 3415 | View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)B. Wijnen, R. Presuhn, K. McCloghrie | Internet Standard | December 2002 |
| 3416 | Version 2 of the Protocol Operations for the Simple Network Management Protocol (SNMP)R. Presuhn, Ed. | Internet Standard | December 2002 |
| 3417 | Transport Mappings for the Simple Network Management Protocol (SNMP)R. Presuhn, Ed. | Internet Standard | December 2002 |
| 3588 | Diameter Base ProtocolP. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko · obsoleted by RFC 6733 | Proposed Standard | September 2003 |
| 3602 | The AES-CBC Cipher Algorithm and Its Use with IPsecS. Frankel, R. Glenn, S. Kelly | Proposed Standard | September 2003 |
| 3631 | Security Mechanisms for the InternetS. Bellovin, Ed., J. Schiller, Ed., C. Kaufman, Ed. | Informational | December 2003 |
| 4026 | Provider Provisioned Virtual Private Network (VPN) TerminologyL. Andersson, T. Madsen | Informational | March 2005 |
| 4031 | Service Requirements for Layer 3 Provider Provisioned Virtual Private Networks (PPVPNs)M. Carugi, Ed., D. McDysan, Ed. | Informational | April 2005 |
| 4110 | A Framework for Layer 3 Provider-Provisioned Virtual Private Networks (PPVPNs)R. Callon, M. Suzuki | Informational | July 2005 |