| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGESD. Crocker · obsoleted by RFC 2822 | Internet Standard | August 1982 |
| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1422 | Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key ManagementS. Kent | Historic | February 1993 |
| 1423 | Privacy Enhancement for Internet Electronic Mail: Part III: Algorithms, Modes, and IdentifiersD. Balenson | Historic | February 1993 |
| 1510 | The Kerberos Network Authentication Service (V5)J. Kohl, C. Neuman · obsoleted by RFC 4120, RFC 6649 | Historic | September 1993 |
| 1519 | Classless Inter-Domain Routing (CIDR): an Address Assignment and Aggregation StrategyV. Fuller, T. Li, J. Yu, K. Varadhan · obsoleted by RFC 4632 | Proposed Standard | September 1993 |
| 1738 | Uniform Resource Locators (URL)T. Berners-Lee, L. Masinter, M. McCahill · obsoleted by RFC 4248, RFC 4266 | Proposed Standard | December 1994 |
| 1778 | The String Representation of Standard Attribute SyntaxesT. Howes, S. Kille, W. Yeong, C. Robbins · obsoleted by RFC 3494 | Historic | March 1995 |
| 1883 | Internet Protocol, Version 6 (IPv6) SpecificationS. Deering, R. Hinden · obsoleted by RFC 2460 | Proposed Standard | December 1995 |
| 2044 | UTF-8, a transformation format of Unicode and ISO 10646F. Yergeau · obsoleted by RFC 2279 | Informational | October 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2247 | Using Domains in LDAP/X.500 Distinguished NamesS. Kille, M. Wahl, A. Grimstad, R. Huber, S. Sataluri | Proposed Standard | January 1998 |
| 2252 | Lightweight Directory Access Protocol (v3): Attribute Syntax DefinitionsM. Wahl, A. Coulbeck, T. Howes, S. Kille · obsoleted by RFC 4510, RFC 4512, RFC 4517, RFC 4523 | Proposed Standard | December 1997 |
| 2277 | IETF Policy on Character Sets and LanguagesH. Alvestrand | Best Current Practice | January 1998 |
| 2279 | UTF-8, a transformation format of ISO 10646F. Yergeau · obsoleted by RFC 3629 | Draft Standard | January 1998 |
| 2459 | Internet X.509 Public Key Infrastructure Certificate and CRL ProfileR. Housley, W. Ford, W. Polk, D. Solo · obsoleted by RFC 3280 | Proposed Standard | January 1999 |
| 2560 | X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSPM. Myers, R. Ankney, A. Malpani, S. Galperin, C. Adams · obsoleted by RFC 6960 | Proposed Standard | June 1999 |
| 3161 | Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)C. Adams, P. Cain, D. Pinkas, R. Zuccherato | Proposed Standard | August 2001 |
| 3279 | Algorithms and Identifiers for the Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileL. Bassham, W. Polk, R. Housley | Proposed Standard | May 2002 |