| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 1122 | Requirements for Internet Hosts - Communication LayersR. Braden, Ed. | Internet Standard | October 1989 |
| 1510 | The Kerberos Network Authentication Service (V5)J. Kohl, C. Neuman · obsoleted by RFC 4120, RFC 6649 | Historic | September 1993 |
| 1602 | The Internet Standards Process -- Revision 2Internet Architecture Board, Internet Engineering Steering Group · obsoleted by RFC 2026 | Informational | March 1994 |
| 1737 | Functional Requirements for Uniform Resource NamesK. Sollins, L. Masinter | Informational | December 1994 |
| 1964 | The Kerberos Version 5 GSS-API MechanismJ. Linn | Proposed Standard | June 1996 |
| 1982 | Serial Number ArithmeticR. Elz, R. Bush | Proposed Standard | August 1996 |
| 1994 | PPP Challenge Handshake Authentication Protocol (CHAP)W. Simpson | Draft Standard | August 1996 |
| 2025 | The Simple Public-Key GSS-API Mechanism (SPKM)C. Adams | Proposed Standard | October 1996 |
| 2045 | Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message BodiesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2279 | UTF-8, a transformation format of ISO 10646F. Yergeau · obsoleted by RFC 3629 | Draft Standard | January 1998 |
| 2373 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering · obsoleted by RFC 3513 | Proposed Standard | July 1998 |
| 2396 | Uniform Resource Identifiers (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter · obsoleted by RFC 3986 | Draft Standard | August 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2404 | The Use of HMAC-SHA-1-96 within ESP and AHC. Madson, R. Glenn | 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 |
| 2409 | The Internet Key Exchange (IKE)D. Harkins, D. Carrel · obsoleted by RFC 4306 | Historic | 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 |
| 2732 | Format for Literal IPv6 Addresses in URL'sR. Hinden, B. Carpenter, L. Masinter · obsoleted by RFC 3986 | Proposed Standard | December 1999 |
| 2945 | The SRP Authentication and Key Exchange SystemT. Wu | Proposed Standard | September 2000 |
| 3066 | Tags for the Identification of LanguagesH. Alvestrand · obsoleted by RFC 4646, RFC 4647 | Best Current Practice | January 2001 |
| 3347 | Small Computer Systems Interface protocol over the Internet (iSCSI) Requirements and Design ConsiderationsM. Krueger, R. Haagens | Proposed Standard | July 2002 |
| 3385 | Internet Protocol Small Computer System Interface (iSCSI) Cyclic Redundancy Check (CRC)/Checksum ConsiderationsD. Sheinwald, J. Satran, P. Thaler, V. Cavanna | Informational | September 2002 |
| 3454 | Preparation of Internationalized Strings ("stringprep")P. Hoffman, M. Blanchet · obsoleted by RFC 7564 | Proposed Standard | January 2003 |
| 3566 | The AES-XCBC-MAC-96 Algorithm and Its Use With IPsecS. Frankel, H. Herbert | Proposed Standard | September 2003 |
| 3686 | Using Advanced Encryption Standard (AES) Counter Mode With IPsec Encapsulating Security Payload (ESP)R. Housley | Proposed Standard | January 2004 |
| 3721 | Internet Small Computer Systems Interface (iSCSI) Naming and DiscoveryM. Bakke, J. Hafner, J. Hufferd, K. Voruganti, M. Krueger | Informational | April 2004 |
| 3722 | String Profile for Internet Small Computer Systems Interface (iSCSI) NamesM. Bakke | Proposed Standard | April 2004 |
| 3723 | Securing Block Storage Protocols over IPB. Aboba, J. Tseng, J. Walker, V. Rangan, F. Travostino | Proposed Standard | April 2004 |