| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2585 | Internet X.509 Public Key Infrastructure Operational Protocols: FTP and HTTPR. Housley, P. Hoffman | Proposed Standard | May 1999 |
| 4919 | IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs): Overview, Assumptions, Problem Statement, and GoalsN. Kushalnagar, G. Montenegro, C. Schumacher | Informational | August 2007 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5272 | Certificate Management over CMS (CMC)J. Schaad, M. Myers · obsoleted by RFC 10002 | Proposed Standard | June 2008 |
| 5929 | Channel Bindings for TLSJ. Altman, N. Williams, L. Zhu | Proposed Standard | July 2010 |
| 5958 | Asymmetric Key PackagesS. Turner | Proposed Standard | August 2010 |
| 5967 | The application/pkcs10 Media TypeS. Turner | Informational | August 2010 |
| 6347 | Datagram Transport Layer Security Version 1.2E. Rescorla, N. Modadugu · obsoleted by RFC 9147 | Proposed Standard | January 2012 |
| 6402 | Certificate Management over CMS (CMC) UpdatesJ. Schaad · obsoleted by RFC 10002, RFC 10003, RFC 10004 | Proposed Standard | November 2011 |
| 6690 | Constrained RESTful Environments (CoRE) Link FormatZ. Shelby | Proposed Standard | August 2012 |
| 7030 | Enrollment over Secure TransportM. Pritikin, Ed., P. Yee, Ed., D. Harkins, Ed. | Proposed Standard | October 2013 |
| 7228 | Terminology for Constrained-Node NetworksC. Bormann, M. Ersue, A. Keranen | Informational | May 2014 |
| 7230 | Hypertext Transfer Protocol (HTTP/1.1): Message Syntax and RoutingR. Fielding, Ed., J. Reschke, Ed. · obsoleted by RFC 9110, RFC 9112 | Proposed Standard | June 2014 |
| 7251 | AES-CCM Elliptic Curve Cryptography (ECC) Cipher Suites for TLSD. McGrew, D. Bailey, M. Campagna, R. Dugal | Informational | June 2014 |
| 7252 | The Constrained Application Protocol (CoAP)Z. Shelby, K. Hartke, C. Bormann | Proposed Standard | June 2014 |
| 7299 | Object Identifier Registry for the PKIX Working GroupR. Housley | Informational | July 2014 |
| 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 |
| 7627 | Transport Layer Security (TLS) Session Hash and Extended Master Secret ExtensionK. Bhargavan, Ed., A. Delignat-Lavaud, A. Pironti, A. Langley, M. Ray · obsoleted by RFC 9846 | Proposed Standard | September 2015 |
| 7748 | Elliptic Curves for SecurityA. Langley, M. Hamburg, S. Turner | Informational | January 2016 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 7925 | Transport Layer Security (TLS) / Datagram Transport Layer Security (DTLS) Profiles for the Internet of ThingsH. Tschofenig, Ed., T. Fossati | Proposed Standard | July 2016 |
| 7959 | Block-Wise Transfers in the Constrained Application Protocol (CoAP)C. Bormann, Z. Shelby, Ed. | Proposed Standard | August 2016 |
| 8075 | Guidelines for Mapping Implementations: HTTP to the Constrained Application Protocol (CoAP)A. Castellani, S. Loreto, A. Rahman, T. Fossati, E. Dijk | Proposed Standard | February 2017 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 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 |
| 8551 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 4.0 Message SpecificationJ. Schaad, B. Ramsdell, S. Turner | Proposed Standard | April 2019 |
| 8710 | Multipart Content-Format for the Constrained Application Protocol (CoAP)T. Fossati, K. Hartke, C. Bormann | Proposed Standard | February 2020 |
| 9146 | Connection Identifier for DTLS 1.2E. Rescorla, Ed., H. Tschofenig, Ed., T. Fossati, A. Kraus | Proposed Standard | March 2022 |
| 9147 | The Datagram Transport Layer Security (DTLS) Protocol Version 1.3E. Rescorla, H. Tschofenig, N. Modadugu | Proposed Standard | April 2022 |