| 20 | ASCII format for network interchangeV.G. Cerf | Internet Standard | October 1969 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 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 |
| 5116 | An Interface and Algorithms for Authenticated EncryptionD. McGrew | Proposed Standard | January 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 |
| 5297 | Synthetic Initialization Vector (SIV) Authenticated Encryption Using the Advanced Encryption Standard (AES)D. Harkins | Informational | October 2008 |
| 5705 | Keying Material Exporters for Transport Layer Security (TLS)E. Rescorla | Proposed Standard | March 2010 |
| 5869 | HMAC-based Extract-and-Expand Key Derivation Function (HKDF)H. Krawczyk, P. Eronen | Informational | May 2010 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 5905 | Network Time Protocol Version 4: Protocol and Algorithms SpecificationD. Mills, J. Martin, Ed., J. Burbank, W. Kasch | Proposed Standard | June 2010 |
| 6125 | Representation and Verification of Domain-Based Application Service Identity within Internet Public Key Infrastructure Using X.509 (PKIX) Certificates in the Context of Transport Layer Security (TLS)P. Saint-Andre, J. Hodges · obsoleted by RFC 9525 | Proposed Standard | March 2011 |
| 6335 | Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number RegistryM. Cotton, L. Eggert, J. Touch, M. Westerlund, S. Cheshire | Best Current Practice | August 2011 |
| 6874 | Representing IPv6 Zone Identifiers in Address Literals and Uniform Resource IdentifiersB. Carpenter, S. Cheshire, R. Hinden · obsoleted by RFC 9844 | Proposed Standard | February 2013 |
| 7301 | Transport Layer Security (TLS) Application-Layer Protocol Negotiation ExtensionS. Friedl, A. Popov, A. Langley, E. Stephan | Proposed Standard | July 2014 |
| 7384 | Security Requirements of Time Protocols in Packet Switched NetworksT. Mizrahi | Informational | October 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 |
| 7822 | Network Time Protocol Version 4 (NTPv4) Extension FieldsT. Mizrahi, D. Mayer | Proposed Standard | March 2016 |
| 7841 | RFC Streams, Headers, and BoilerplatesJ. Halpern, Ed., L. Daigle, Ed., O. Kolkman, Ed. | Informational | May 2016 |
| 8174 | Ambiguity of Uppercase vs Lowercase in RFC 2119 Key WordsB. Leiba | Best Current Practice | May 2017 |
| 8446 | The Transport Layer Security (TLS) Protocol Version 1.3E. Rescorla · obsoleted by RFC 9846 | Proposed Standard | August 2018 |
| 8573 | Message Authentication Code for the Network Time ProtocolA. Malhotra, S. Goldberg | Proposed Standard | June 2019 |