| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1918 | Address Allocation for Private InternetsY. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear | Best Current Practice | February 1996 |
| 1939 | Post Office Protocol - Version 3J. Myers, M. Rose | Internet Standard | May 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 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 |
| 2460 | Internet Protocol, Version 6 (IPv6) SpecificationS. Deering, R. Hinden · obsoleted by RFC 8200 | Draft Standard | December 1998 |
| 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 |
| 2595 | Using TLS with IMAP, POP3 and ACAPC. Newman | Proposed Standard | June 1999 |
| 2616 | Hypertext Transfer Protocol -- HTTP/1.1R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee · obsoleted by RFC 7230, RFC 7231, RFC 7232, RFC 7233, RFC 7234, RFC 7235 | Draft Standard | June 1999 |
| 2782 | A DNS RR for specifying the location of services (DNS SRV)A. Gulbrandsen, P. Vixie, L. Esibov | Proposed Standard | February 2000 |
| 2818 | HTTP Over TLSE. Rescorla · obsoleted by RFC 9110 | Informational | May 2000 |
| 2830 | Lightweight Directory Access Protocol (v3): Extension for Transport Layer SecurityJ. Hodges, R. Morgan, M. Wahl · obsoleted by RFC 4510, RFC 4511, RFC 4513 | Proposed Standard | May 2000 |
| 3207 | SMTP Service Extension for Secure SMTP over Transport Layer SecurityP. Hoffman | Proposed Standard | February 2002 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3403 | Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) DatabaseM. Mealling | Proposed Standard | October 2002 |
| 3411 | An Architecture for Describing Simple Network Management Protocol (SNMP) Management FrameworksD. Harrington, R. Presuhn, B. Wijnen | Internet Standard | December 2002 |
| 3490 | Internationalizing Domain Names in Applications (IDNA)P. Faltstrom, P. Hoffman, A. Costello · obsoleted by RFC 5890, RFC 5891 | Proposed Standard | March 2003 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 3920 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre, Ed. · obsoleted by RFC 6120 | Proposed Standard | October 2004 |
| 3958 | Domain-Based Application Service Location Using SRV RRs and the Dynamic Delegation Discovery Service (DDDS)L. Daigle, A. Newton | Proposed Standard | January 2005 |
| 3977 | Network News Transfer Protocol (NNTP)C. Feather | Proposed Standard | October 2006 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4033 | DNS Security Introduction and RequirementsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4343 | Domain Name System (DNS) Case Insensitivity ClarificationD. Eastlake 3rd | Proposed Standard | January 2006 |
| 4347 | Datagram Transport Layer SecurityE. Rescorla, N. Modadugu · obsoleted by RFC 6347 | Historic | April 2006 |
| 4511 | Lightweight Directory Access Protocol (LDAP): The ProtocolJ. Sermersheim, Ed. | Proposed Standard | June 2006 |
| 4513 | Lightweight Directory Access Protocol (LDAP): Authentication Methods and Security MechanismsR. Harrison, Ed. | Proposed Standard | June 2006 |
| 4514 | Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished NamesK. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4519 | Lightweight Directory Access Protocol (LDAP): Schema for User ApplicationsA. Sciberras, Ed. | Proposed Standard | June 2006 |
| 4642 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)K. Murchison, J. Vinocur, C. Newman | Proposed Standard | October 2006 |
| 4741 | NETCONF Configuration ProtocolR. Enns, Ed. · obsoleted by RFC 6241 | Proposed Standard | December 2006 |
| 4742 | Using the NETCONF Configuration Protocol over Secure SHell (SSH)M. Wasserman, T. Goddard · obsoleted by RFC 6242 | Proposed Standard | December 2006 |
| 4880 | OpenPGP Message FormatJ. Callas, L. Donnerhacke, H. Finney, D. Shaw, R. Thayer · obsoleted by RFC 9580 | Proposed Standard | November 2007 |
| 4949 | Internet Security Glossary, Version 2R. Shirey | Informational | August 2007 |
| 4954 | SMTP Service Extension for AuthenticationR. Siemborski, Ed., A. Melnikov, Ed. | Proposed Standard | July 2007 |
| 4985 | Internet X.509 Public Key Infrastructure Subject Alternative Name for Expression of Service NameS. Santesson | Proposed Standard | August 2007 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileD. Cooper, S. Santesson, S. Farrell, S. Boeyen, R. Housley, W. Polk | Proposed Standard | May 2008 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5424 | The Syslog ProtocolR. Gerhards | Proposed Standard | March 2009 |
| 5425 | Transport Layer Security (TLS) Transport Mapping for SyslogF. Miao, Ed., Y. Ma, Ed., J. Salowey, Ed. | Proposed Standard | March 2009 |
| 5539 | NETCONF over Transport Layer Security (TLS)M. Badra · obsoleted by RFC 7589 | Proposed Standard | May 2009 |
| 5630 | The Use of the SIPS URI Scheme in the Session Initiation Protocol (SIP)F. Audet | Proposed Standard | October 2009 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 5891 | Internationalized Domain Names in Applications (IDNA): ProtocolJ. Klensin | Proposed Standard | August 2010 |
| 5922 | Domain Certificates in the Session Initiation Protocol (SIP)V. Gurbani, S. Lawrence, A. Jeffrey | Proposed Standard | June 2010 |
| 5953 | Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)W. Hardaker · obsoleted by RFC 6353 | Proposed Standard | August 2010 |
| 5971 | GIST: General Internet Signalling TransportH. Schulzrinne, R. Hancock | Experimental | October 2010 |
| 6012 | Datagram Transport Layer Security (DTLS) Transport Mapping for SyslogJ. Salowey, T. Petch, R. Gerhards, H. Feng | Proposed Standard | October 2010 |
| 6066 | Transport Layer Security (TLS) Extensions: Extension DefinitionsD. Eastlake 3rd | Proposed Standard | January 2011 |
| 6120 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre | Proposed Standard | March 2011 |
| 6186 | Use of SRV Records for Locating Email Submission/Access ServicesC. Daboo | Proposed Standard | March 2011 |