| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1950 | ZLIB Compressed Data Format Specification version 3.3P. Deutsch, J-L. Gailly | Informational | May 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 3174 | US Secure Hash Algorithm 1 (SHA1)D. Eastlake 3rd, P. Jones | Informational | September 2001 |
| 3230 | Instance Digests in HTTPJ. Mogul, A. Van Hoff · obsoleted by RFC 9530 | Proposed Standard | January 2002 |
| 4648 | The Base16, Base32, and Base64 Data EncodingsS. Josefsson | Proposed Standard | October 2006 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5789 | PATCH Method for HTTPL. Dusseault, J. Snell | Proposed Standard | March 2010 |
| 6151 | Updated Security Considerations for the MD5 Message-Digest and the HMAC-MD5 AlgorithmsS. Turner, L. Chen | Informational | March 2011 |
| 6194 | Security Considerations for the SHA-0 and SHA-1 Message-Digest AlgorithmsT. Polk, L. Chen, S. Turner, P. Hoffman | Informational | March 2011 |
| 6211 | Cryptographic Message Syntax (CMS) Algorithm Identifier Protection AttributeJ. Schaad | Proposed Standard | April 2011 |
| 6234 | US Secure Hash Algorithms (SHA and SHA-based HMAC and HKDF)D. Eastlake 3rd, T. Hansen | Informational | May 2011 |
| 7396 | JSON Merge PatchP. Hoffman, J. Snell | Proposed Standard | October 2014 |
| 7405 | Case-Sensitive String Support in ABNFP. Kyzivat | Proposed Standard | December 2014 |
| 7696 | Guidelines for Cryptographic Algorithm Agility and Selecting Mandatory-to-Implement AlgorithmsR. Housley | Best Current Practice | November 2015 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8126 | Guidelines for Writing an IANA Considerations Section in RFCsM. Cotton, B. Leiba, T. Narten | Best Current Practice | June 2017 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8188 | Encrypted Content-Encoding for HTTPM. Thomson | Proposed Standard | June 2017 |
| 8446 | The Transport Layer Security (TLS) Protocol Version 1.3E. Rescorla · obsoleted by RFC 9846 | Proposed Standard | August 2018 |
| 8792 | Handling Long Lines in Content of Internet-Drafts and RFCsK. Watsen, E. Auerswald, A. Farrel, Q. Wu | Informational | June 2020 |
| 8941 | Structured Field Values for HTTPM. Nottingham, P-H. Kamp · obsoleted by RFC 9651 | Proposed Standard | February 2021 |
| 9110 | HTTP SemanticsR. Fielding, Ed., M. Nottingham, Ed., J. Reschke, Ed. | Internet Standard | June 2022 |
| 9112 | HTTP/1.1R. Fielding, Ed., M. Nottingham, Ed., J. Reschke, Ed. | Internet Standard | June 2022 |
| 9260 | Stream Control Transmission ProtocolR. Stewart, M. Tüxen, K. Nielsen | Proposed Standard | June 2022 |
| 9421 | HTTP Message SignaturesA. Backman, Ed., J. Richer, Ed., M. Sporny | Proposed Standard | February 2024 |
| 9457 | Problem Details for HTTP APIsM. Nottingham, E. Wilde, S. Dalal | Proposed Standard | July 2023 |