| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGESD. Crocker · obsoleted by RFC 2822 | Internet Standard | August 1982 |
| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1826 | IP Authentication HeaderR. Atkinson · obsoleted by RFC 2402 | Proposed Standard | August 1995 |
| 1827 | IP Encapsulating Security Payload (ESP)R. Atkinson · obsoleted by RFC 2406 | Proposed Standard | August 1995 |
| 1958 | Architectural Principles of the InternetB. Carpenter, Ed. | Informational | June 1996 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2251 | Lightweight Directory Access Protocol (v3)M. Wahl, T. Howes, S. Kille · obsoleted by RFC 4510, RFC 4511, RFC 4512, RFC 4513 | Proposed Standard | December 1997 |
| 2367 | PF_KEY Key Management API, Version 2D. McDonald, C. Metz, B. Phan | Informational | July 1998 |
| 2394 | IP Payload Compression Using DEFLATER. Pereira | Informational | December 1998 |
| 2395 | IP Payload Compression Using LZSR. Friend, R. Monsour | Informational | December 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2403 | The Use of HMAC-MD5-96 within ESP and AHC. Madson, R. Glenn | Proposed Standard | November 1998 |
| 2404 | The Use of HMAC-SHA-1-96 within ESP and AHC. Madson, R. Glenn | Proposed Standard | November 1998 |
| 2405 | The ESP DES-CBC Cipher Algorithm With Explicit IVC. Madson, N. Doraswamy | 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 |
| 2410 | The NULL Encryption Algorithm and Its Use With IPsecR. Glenn, S. Kent | Proposed Standard | November 1998 |
| 2434 | Guidelines for Writing an IANA Considerations Section in RFCsT. Narten, H. Alvestrand · obsoleted by RFC 5226 | Best Current Practice | October 1998 |
| 2451 | The ESP CBC-Mode Cipher AlgorithmsR. Pereira, R. Adams | 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 |
| 2475 | An Architecture for Differentiated ServicesS. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss | Informational | December 1998 |
| 2522 | Photuris: Session-Key Management ProtocolP. Karn, W. Simpson | Experimental | March 1999 |
| 2775 | Internet TransparencyB. Carpenter | Informational | February 2000 |
| 2983 | Differentiated Services and TunnelsD. Black | Informational | October 2000 |
| 3051 | IP Payload Compression Using ITU-T V.44 Packet MethodJ. Heath, J. Border | Informational | January 2001 |
| 3168 | The Addition of Explicit Congestion Notification (ECN) to IPK. Ramakrishnan, S. Floyd, D. Black | Proposed Standard | September 2001 |
| 3173 | IP Payload Compression Protocol (IPComp)A. Shacham, B. Monsour, R. Pereira, M. Thomas | Proposed Standard | September 2001 |
| 3280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileR. Housley, W. Polk, W. Ford, D. Solo · obsoleted by RFC 5280 | Proposed Standard | May 2002 |
| 3439 | Some Internet Architectural Guidelines and PhilosophyR. Bush, D. Meyer | Informational | December 2002 |
| 3447 | Public-Key Cryptography Standards (PKCS) #1: RSA Cryptography Specifications Version 2.1J. Jonsson, B. Kaliski · obsoleted by RFC 8017 | Informational | February 2003 |
| 3513 | Internet Protocol Version 6 (IPv6) Addressing ArchitectureR. Hinden, S. Deering · obsoleted by RFC 4291 | Proposed Standard | April 2003 |
| 3526 | More Modular Exponential (MODP) Diffie-Hellman groups for Internet Key Exchange (IKE)T. Kivinen, M. Kojo | Proposed Standard | May 2003 |
| 3566 | The AES-XCBC-MAC-96 Algorithm and Its Use With IPsecS. Frankel, H. Herbert | Proposed Standard | September 2003 |
| 3602 | The AES-CBC Cipher Algorithm and Its Use with IPsecS. Frankel, R. Glenn, S. Kelly | Proposed Standard | September 2003 |
| 3664 | The AES-XCBC-PRF-128 Algorithm for the Internet Key Exchange Protocol (IKE)P. Hoffman · obsoleted by RFC 4434 | Proposed Standard | January 2004 |
| 3715 | IPsec-Network Address Translation (NAT) Compatibility RequirementsB. Aboba, W. Dixon | Informational | March 2004 |
| 3748 | Extensible Authentication Protocol (EAP)B. Aboba, L. Blunk, J. Vollbrecht, J. Carlson, H. Levkowetz, Ed. | Proposed Standard | June 2004 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4302 | IP Authentication HeaderS. Kent | Proposed Standard | December 2005 |
| 4303 | IP Encapsulating Security Payload (ESP)S. Kent | Proposed Standard | December 2005 |