| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2246 | The TLS Protocol Version 1.0T. Dierks, C. Allen · obsoleted by RFC 4346 | Historic | January 1999 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3316 | Internet Protocol Version 6 (IPv6) for Some Second and Third Generation Cellular HostsJ. Arkko, G. Kuijpers, H. Soliman, J. Loughney, J. Wiljakka · obsoleted by RFC 7066 | Informational | May 2003 |
| 3329 | Security Mechanism Agreement for the Session Initiation Protocol (SIP)J. Arkko, V. Torvinen, G. Camarillo, A. Niemi, T. Haukka | Proposed Standard | January 2003 |
| 3436 | Transport Layer Security over Stream Control Transmission ProtocolA. Jungmaier, E. Rescorla, M. Tuexen | Proposed Standard | December 2002 |
| 3470 | Guidelines for the Use of Extensible Markup Language (XML) within IETF ProtocolsS. Hollenbeck, M. Rose, L. Masinter | Best Current Practice | January 2003 |
| 3489 | STUN - Simple Traversal of User Datagram Protocol (UDP) Through Network Address Translators (NATs)J. Rosenberg, J. Weinberger, C. Huitema, R. Mahy · obsoleted by RFC 5389 | Proposed Standard | March 2003 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 3546 | Transport Layer Security (TLS) ExtensionsS. Blake-Wilson, M. Nystrom, D. Hopwood, J. Mikkelsen, T. Wright · obsoleted by RFC 4366 | Proposed Standard | June 2003 |
| 3552 | Guidelines for Writing RFC Text on Security ConsiderationsE. Rescorla, B. Korver | Best Current Practice | July 2003 |
| 3568 | Known Content Network (CN) Request-Routing MechanismsA. Barbir, B. Cain, R. Nair, O. Spatscheck | Informational | July 2003 |
| 3588 | Diameter Base ProtocolP. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko · obsoleted by RFC 6733 | Proposed Standard | September 2003 |
| 3656 | The Mailbox Update (MUPDATE) Distributed Mailbox Database ProtocolR. Siemborski | Experimental | December 2003 |
| 3734 | Extensible Provisioning Protocol (EPP) Transport Over TCPS. Hollenbeck · obsoleted by RFC 4934 | Proposed Standard | March 2004 |
| 3749 | Transport Layer Security Protocol Compression MethodsS. Hollenbeck | Proposed Standard | May 2004 |
| 3767 | Securely Available Credentials ProtocolS. Farrell, Ed. | Proposed Standard | June 2004 |
| 3856 | A Presence Event Package for the Session Initiation Protocol (SIP)J. Rosenberg | Proposed Standard | August 2004 |
| 3871 | Operational Security Requirements for Large Internet Service Provider (ISP) IP Network InfrastructureG. Jones, Ed. | Informational | September 2004 |
| 3887 | Message Tracking Query ProtocolT. Hansen | Proposed Standard | September 2004 |
| 3903 | Session Initiation Protocol (SIP) Extension for Event State PublicationA. Niemi, Ed. | Proposed Standard | November 2004 |
| 3920 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre, Ed. · obsoleted by RFC 6120 | Proposed Standard | October 2004 |
| 3943 | Transport Layer Security (TLS) Protocol Compression Using Lempel-Ziv-Stac (LZS)R. Friend | Informational | November 2004 |
| 3983 | Using the Internet Registry Information Service (IRIS) over the Blocks Extensible Exchange Protocol (BEEP)A. Newton, M. Sanz | Proposed Standard | January 2005 |
| 4097 | Middlebox Communications (MIDCOM) Protocol EvaluationM. Barnes, Ed. | Informational | June 2005 |
| 4111 | Security Framework for Provider-Provisioned Virtual Private Networks (PPVPNs)L. Fang, Ed. | Informational | July 2005 |
| 4132 | Addition of Camellia Cipher Suites to Transport Layer Security (TLS)S. Moriai, A. Kato, M. Kanda · obsoleted by RFC 5932 | Proposed Standard | July 2005 |
| 4162 | Addition of SEED Cipher Suites to Transport Layer Security (TLS)H.J. Lee, J.H. Yoon, J.I. Lee | Proposed Standard | September 2005 |
| 4168 | The Stream Control Transmission Protocol (SCTP) as a Transport for the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, G. Camarillo | Proposed Standard | October 2005 |
| 4217 | Securing FTP with TLSP. Ford-Hutchinson | Proposed Standard | October 2005 |
| 4235 | An INVITE-Initiated Dialog Event Package for the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, R. Mahy, Ed. | Proposed Standard | November 2005 |
| 4244 | An Extension to the Session Initiation Protocol (SIP) for Request History InformationM. Barnes, Ed. · obsoleted by RFC 7044 | Proposed Standard | November 2005 |
| 4261 | Common Open Policy Service (COPS) Over Transport Layer Security (TLS)J. Walker, A. Kulkarni, Ed. | Proposed Standard | December 2005 |
| 4279 | Pre-Shared Key Ciphersuites for Transport Layer Security (TLS)P. Eronen, Ed., H. Tschofenig, Ed. | Proposed Standard | December 2005 |
| 4346 | The Transport Layer Security (TLS) Protocol Version 1.1T. Dierks, E. Rescorla · obsoleted by RFC 5246 | Historic | April 2006 |
| 4347 | Datagram Transport Layer SecurityE. Rescorla, N. Modadugu · obsoleted by RFC 6347 | Historic | April 2006 |
| 4366 | Transport Layer Security (TLS) ExtensionsS. Blake-Wilson, M. Nystrom, D. Hopwood, J. Mikkelsen, T. Wright · obsoleted by RFC 5246, RFC 6066 | Proposed Standard | April 2006 |
| 4492 | Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)S. Blake-Wilson, N. Bolyard, V. Gupta, C. Hawk, B. Moeller · obsoleted by RFC 8422 | Informational | May 2006 |
| 4497 | Interworking between the Session Initiation Protocol (SIP) and QSIGJ. Elwell, F. Derks, P. Mourot, O. Rousseau | Best Current Practice | May 2006 |
| 4507 | Transport Layer Security (TLS) Session Resumption without Server-Side StateJ. Salowey, H. Zhou, P. Eronen, H. Tschofenig · obsoleted by RFC 5077 | Proposed Standard | May 2006 |
| 4513 | Lightweight Directory Access Protocol (LDAP): Authentication Methods and Security MechanismsR. Harrison, Ed. | Proposed Standard | June 2006 |
| 4531 | Lightweight Directory Access Protocol (LDAP) Turn OperationK. Zeilenga | Experimental | June 2006 |
| 4540 | NEC's Simple Middlebox Configuration (SIMCO) Protocol Version 3.0M. Stiemerling, J. Quittek, C. Cadar | Experimental | May 2006 |
| 4572 | Connection-Oriented Media Transport over the Transport Layer Security (TLS) Protocol in the Session Description Protocol (SDP)J. Lennox · obsoleted by RFC 8122 | Proposed Standard | July 2006 |
| 4582 | The Binary Floor Control Protocol (BFCP)G. Camarillo, J. Ott, K. Drage · obsoleted by RFC 8855 | Proposed Standard | November 2006 |
| 4616 | The PLAIN Simple Authentication and Security Layer (SASL) MechanismK. Zeilenga, Ed. | Proposed Standard | August 2006 |
| 4642 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)K. Murchison, J. Vinocur, C. Newman | Proposed Standard | October 2006 |
| 4680 | TLS Handshake Message for Supplemental DataS. Santesson | Proposed Standard | October 2006 |
| 4681 | TLS User Mapping ExtensionS. Santesson, A. Medvinsky, J. Ball | Proposed Standard | October 2006 |
| 4712 | Transport Mappings for Real-time Application Quality-of-Service Monitoring (RAQMON) Protocol Data Unit (PDU)A. Siddiqui, D. Romascanu, E. Golovinsky, M. Rahman, Y. Kim | Proposed Standard | October 2006 |
| 4732 | Internet Denial-of-Service ConsiderationsM. Handley, Ed., E. Rescorla, Ed., IAB | Informational | December 2006 |
| 4743 | Using NETCONF over the Simple Object Access Protocol (SOAP)T. Goddard | Historic | December 2006 |
| 4744 | Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)E. Lear, K. Crozier | Historic | December 2006 |
| 4785 | Pre-Shared Key (PSK) Ciphersuites with NULL Encryption for Transport Layer Security (TLS)U. Blumenthal, P. Goel | Proposed Standard | January 2007 |
| 4791 | Calendaring Extensions to WebDAV (CalDAV)C. Daboo, B. Desruisseaux, L. Dusseault | Proposed Standard | March 2007 |
| 4823 | FTP Transport for Secure Peer-to-Peer Business Data Interchange over the InternetT. Harding, R. Scott | Informational | April 2007 |
| 4851 | The Flexible Authentication via Secure Tunneling Extensible Authentication Protocol Method (EAP-FAST)N. Cam-Winget, D. McGrew, J. Salowey, H. Zhou | Informational | May 2007 |
| 4934 | Extensible Provisioning Protocol (EPP) Transport Over TCPS. Hollenbeck · obsoleted by RFC 5734 | Draft Standard | May 2007 |
| 4964 | The P-Answer-State Header Extension to the Session Initiation Protocol for the Open Mobile Alliance Push to Talk over CellularA. Allen, Ed., J. Holm, T. Hallin | Informational | September 2007 |
| 4975 | The Message Session Relay Protocol (MSRP)B. Campbell, Ed., R. Mahy, Ed., C. Jennings, Ed. | Proposed Standard | September 2007 |
| 4976 | Relay Extensions for the Message Sessions Relay Protocol (MSRP)C. Jennings, R. Mahy, A. B. Roach | Proposed Standard | September 2007 |
| 4992 | XML Pipelining with Chunks for the Internet Registry Information ServiceA. Newton | Proposed Standard | August 2007 |
| 5018 | Connection Establishment in the Binary Floor Control Protocol (BFCP)G. Camarillo | Proposed Standard | September 2007 |
| 5019 | The Lightweight Online Certificate Status Protocol (OCSP) Profile for High-Volume EnvironmentsA. Deacon, R. Hurst · obsoleted by RFC 9919 | Proposed Standard | September 2007 |
| 5023 | The Atom Publishing ProtocolJ. Gregorio, Ed., B. de hOra, Ed. | Proposed Standard | October 2007 |
| 5024 | ODETTE File Transfer Protocol 2.0I. Friend | Informational | November 2007 |
| 5049 | Applying Signaling Compression (SigComp) to the Session Initiation Protocol (SIP)C. Bormann, Z. Liu, R. Price, G. Camarillo, Ed. | Proposed Standard | December 2007 |
| 5054 | Using the Secure Remote Password (SRP) Protocol for TLS AuthenticationD. Taylor, T. Wu, N. Mavrogiannopoulos, T. Perrin | Informational | November 2007 |
| 5077 | Transport Layer Security (TLS) Session Resumption without Server-Side StateJ. Salowey, H. Zhou, P. Eronen, H. Tschofenig · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | January 2008 |
| 5081 | Using OpenPGP Keys for Transport Layer Security (TLS) AuthenticationN. Mavrogiannopoulos · obsoleted by RFC 6091 | Experimental | November 2007 |
| 5091 | Identity-Based Cryptography Standard (IBCS) #1: Supersingular Curve Implementations of the BF and BB1 CryptosystemsX. Boyen, L. Martin | Informational | December 2007 |
| 5101 | Specification of the IP Flow Information Export (IPFIX) Protocol for the Exchange of IP Traffic Flow InformationB. Claise, Ed. · obsoleted by RFC 7011 | Proposed Standard | January 2008 |
| 5158 | 6to4 Reverse DNS Delegation SpecificationG. Huston | Informational | March 2008 |
| 5216 | The EAP-TLS Authentication ProtocolD. Simon, B. Aboba, R. Hurst | Proposed Standard | March 2008 |
| 5238 | Datagram Transport Layer Security (DTLS) over the Datagram Congestion Control Protocol (DCCP)T. Phelan | Proposed Standard | May 2008 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5263 | Session Initiation Protocol (SIP) Extension for Partial Notification of Presence InformationM. Lonnfors, J. Costa-Requena, E. Leppanen, H. Khartabil | Proposed Standard | September 2008 |
| 5281 | Extensible Authentication Protocol Tunneled Transport Layer Security Authenticated Protocol Version 0 (EAP-TTLSv0)P. Funk, S. Blake-Wilson | Informational | August 2008 |
| 5364 | Extensible Markup Language (XML) Format Extension for Representing Copy Control Attributes in Resource ListsM. Garcia-Martin, G. Camarillo | Proposed Standard | October 2008 |
| 5415 | Control And Provisioning of Wireless Access Points (CAPWAP) Protocol SpecificationP. Calhoun, Ed., M. Montemurro, Ed., D. Stanley, Ed. | Proposed Standard | March 2009 |
| 5422 | Dynamic Provisioning Using Flexible Authentication via Secure Tunneling Extensible Authentication Protocol (EAP-FAST)N. Cam-Winget, D. McGrew, J. Salowey, H. Zhou | Informational | March 2009 |
| 5456 | IAX: Inter-Asterisk eXchange Version 2M. Spencer, B. Capouch, E. Guy, Ed., F. Miller, K. Shumard | Informational | February 2010 |
| 5469 | DES and IDEA Cipher Suites for Transport Layer Security (TLS)P. Eronen, Ed. · obsoleted by RFC 8996 | Historic | February 2009 |
| 5734 | Extensible Provisioning Protocol (EPP) Transport over TCPS. Hollenbeck | Internet Standard | August 2009 |
| 5878 | Transport Layer Security (TLS) Authorization ExtensionsM. Brown, R. Housley | Experimental | May 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 |
| 6012 | Datagram Transport Layer Security (DTLS) Transport Mapping for SyslogJ. Salowey, T. Petch, R. Gerhards, H. Feng | Proposed Standard | October 2010 |
| 6042 | Transport Layer Security (TLS) Authorization Using KeyNoteA. Keromytis | Informational | October 2010 |
| 6083 | Datagram Transport Layer Security (DTLS) for Stream Control Transmission Protocol (SCTP)M. Tuexen, R. Seggelmann, E. Rescorla | Proposed Standard | January 2011 |
| 6084 | General Internet Signaling Transport (GIST) over Stream Control Transmission Protocol (SCTP) and Datagram Transport Layer Security (DTLS)X. Fu, C. Dickmann, J. Crowcroft | Experimental | January 2011 |
| 6176 | Prohibiting Secure Sockets Layer (SSL) Version 2.0S. Turner, T. Polk | Proposed Standard | March 2011 |
| 6347 | Datagram Transport Layer Security Version 1.2E. Rescorla, N. Modadugu · obsoleted by RFC 9147 | Proposed Standard | January 2012 |
| 6353 | Transport Layer Security (TLS) Transport Model for the Simple Network Management Protocol (SNMP)W. Hardaker | Internet Standard | July 2011 |
| 6367 | Addition of the Camellia Cipher Suites to Transport Layer Security (TLS)S. Kanno, M. Kanda | Informational | September 2011 |
| 6460 | Suite B Profile for Transport Layer Security (TLS)M. Salter, R. Housley | Historic | January 2012 |
| 6614 | Transport Layer Security (TLS) Encryption for RADIUSS. Winter, M. McCauley, S. Venaas, K. Wierenga | Experimental | May 2012 |
| 6739 | Synchronizing Service Boundaries and <mapping> Elements Based on the Location-to-Service Translation (LoST) ProtocolH. Schulzrinne, H. Tschofenig | Experimental | October 2012 |
| 6749 | The OAuth 2.0 Authorization FrameworkD. Hardt, Ed. | Proposed Standard | October 2012 |
| 6750 | The OAuth 2.0 Authorization Framework: Bearer Token UsageM. Jones, D. Hardt | Proposed Standard | October 2012 |
| 7030 | Enrollment over Secure TransportM. Pritikin, Ed., P. Yee, Ed., D. Harkins, Ed. | Proposed Standard | October 2013 |
| 7457 | Summarizing Known Attacks on Transport Layer Security (TLS) and Datagram TLS (DTLS)Y. Sheffer, R. Holz, P. Saint-Andre | Informational | February 2015 |
| 7465 | Prohibiting RC4 Cipher SuitesA. Popov | Proposed Standard | February 2015 |
| 7507 | TLS Fallback Signaling Cipher Suite Value (SCSV) for Preventing Protocol Downgrade AttacksB. Moeller, A. Langley · obsoleted by RFC 8996 | Proposed Standard | April 2015 |
| 7525 | Recommendations for Secure Use of Transport Layer Security (TLS) and Datagram Transport Layer Security (DTLS)Y. Sheffer, R. Holz, P. Saint-Andre · obsoleted by RFC 9325 | Best Current Practice | May 2015 |
| 7562 | Transport Layer Security (TLS) Authorization Using Digital Transmission Content Protection (DTCP) CertificatesD. Thakore | Informational | July 2015 |
| 7568 | Deprecating Secure Sockets Layer Version 3.0R. Barnes, M. Thomson, A. Pironti, A. Langley | Proposed Standard | June 2015 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8143 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)J. Elie | Proposed Standard | April 2017 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8261 | Datagram Transport Layer Security (DTLS) Encapsulation of SCTP PacketsM. Tuexen, R. Stewart, R. Jesup, S. Loreto | Proposed Standard | November 2017 |
| 8422 | Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS) Versions 1.2 and EarlierY. Nir, S. Josefsson, M. Pegourie-Gonnard · obsoleted by RFC 9846 | Proposed Standard | August 2018 |
| 8446 | The Transport Layer Security (TLS) Protocol Version 1.3E. Rescorla · obsoleted by RFC 9846 | Proposed Standard | August 2018 |
| 8447 | IANA Registry Updates for TLS and DTLSJ. Salowey, S. Turner | Proposed Standard | August 2018 |