| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 4422 | Simple Authentication and Security Layer (SASL)A. Melnikov, Ed., K. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4648 | The Base16, Base32, and Base64 Data EncodingsS. Josefsson | Proposed Standard | October 2006 |
| 4959 | IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client ResponseR. Siemborski, A. Gulbrandsen | Proposed Standard | September 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 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5801 | Using Generic Security Service Application Program Interface (GSS-API) Mechanisms in Simple Authentication and Security Layer (SASL): The GS2 Mechanism FamilyS. Josefsson, N. Williams | Proposed Standard | July 2010 |
| 5839 | An Extension to Session Initiation Protocol (SIP) Events for Conditional Event NotificationA. Niemi, D. Willis, Ed. | Proposed Standard | May 2010 |
| 5849 | The OAuth 1.0 ProtocolE. Hammer-Lahav, Ed. · obsoleted by RFC 6749 | Informational | April 2010 |
| 6120 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre | Proposed Standard | March 2011 |
| 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 |
| 6819 | OAuth 2.0 Threat Model and Security ConsiderationsT. Lodderstedt, Ed., M. McGloin, P. Hunt | Informational | January 2013 |
| 7033 | WebFingerP. Jones, G. Salgueiro, M. Jones, J. Smarr | Proposed Standard | September 2013 |
| 7159 | The JavaScript Object Notation (JSON) Data Interchange FormatT. Bray, Ed. · obsoleted by RFC 8259 | Proposed Standard | March 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 |
| 7519 | JSON Web Token (JWT)M. Jones, J. Bradley, N. Sakimura | Proposed Standard | May 2015 |
| 7591 | OAuth 2.0 Dynamic Client Registration ProtocolJ. Richer, Ed., M. Jones, J. Bradley, M. Machulak, P. Hunt | Proposed Standard | July 2015 |