| 5657 | Guidance on Interoperation and Implementation Reports for Advancement to Draft StandardL. Dusseault, R. Sparks | Best Current Practice | September 2009 |
| 5231 | Sieve Email Filtering: Relational ExtensionW. Segmuller, B. Leiba | Proposed Standard | January 2008 |
| 5229 | Sieve Email Filtering: Variables ExtensionK. Homme | Proposed Standard | January 2008 |
| 5228 | Sieve: An Email Filtering LanguageP. Guenther, Ed., T. Showalter, Ed. | Proposed Standard | January 2008 |
| 5134 | A Uniform Resource Name Namespace for the EPCglobal Electronic Product Code (EPC) and Related StandardsM. Mealling | Informational | January 2008 |
| 5119 | A Uniform Resource Name (URN) Namespace for the Society of Motion Picture and Television Engineers (SMPTE)T. Edwards | Informational | February 2008 |
| 5115 | Telephony Routing over IP (TRIP) Attribute for Resource PriorityK. Carlberg, P. O'Hanlon | Proposed Standard | January 2008 |
| 5104 | Codec Control Messages in the RTP Audio-Visual Profile with Feedback (AVPF)S. Wenger, U. Chandra, M. Westerlund, B. Burman | Proposed Standard | February 2008 |
| 5092 | IMAP URL SchemeA. Melnikov, Ed., C. Newman | Proposed Standard | November 2007 |
| 5064 | The Archived-At Message Header FieldM. Duerst | Proposed Standard | December 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 |
| 5034 | The Post Office Protocol (POP3) Simple Authentication and Security Layer (SASL) Authentication MechanismR. Siemborski, A. Menon-Sen | Proposed Standard | July 2007 |
| 5032 | WITHIN Search Extension to the IMAP ProtocolE. Burger, Ed. | Proposed Standard | September 2007 |
| 5031 | A Uniform Resource Name (URN) for Emergency and Other Well-Known ServicesH. Schulzrinne | Proposed Standard | January 2008 |
| 5009 | Private Header (P-Header) Extension to the Session Initiation Protocol (SIP) for Authorization of Early MediaR. Ejzak | Informational | September 2007 |
| 5002 | The Session Initiation Protocol (SIP) P-Profile-Key Private Header (P-Header)G. Camarillo, G. Blanco | Informational | August 2007 |
| 4997 | Formal Notation for RObust Header Compression (ROHC-FN)R. Finking, G. Pelletier | Proposed Standard | July 2007 |
| 4978 | The IMAP COMPRESS ExtensionA. Gulbrandsen | Proposed Standard | August 2007 |
| 4976 | Relay Extensions for the Message Sessions Relay Protocol (MSRP)C. Jennings, R. Mahy, A. B. Roach | Proposed Standard | September 2007 |
| 4975 | The Message Session Relay Protocol (MSRP)B. Campbell, Ed., R. Mahy, Ed., C. Jennings, Ed. | Proposed Standard | September 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 |
| 4959 | IMAP Extension for Simple Authentication and Security Layer (SASL) Initial Client ResponseR. Siemborski, A. Gulbrandsen | Proposed Standard | September 2007 |
| 4954 | SMTP Service Extension for AuthenticationR. Siemborski, Ed., A. Melnikov, Ed. | Proposed Standard | July 2007 |
| 4926 | A URN Namespace for GEANTT. Kalin, M. Molina | Informational | July 2007 |
| 4904 | Representing Trunk Groups in tel/sip Uniform Resource Identifiers (URIs)V. Gurbani, C. Jennings | Proposed Standard | June 2007 |
| 4876 | A Configuration Profile Schema for Lightweight Directory Access Protocol (LDAP)-Based AgentsB. Neal-Joslin, Ed., L. Howard, M. Ansari | Informational | May 2007 |
| 4871 | DomainKeys Identified Mail (DKIM) SignaturesE. Allman, J. Callas, M. Delany, M. Libbey, J. Fenton, M. Thomas · obsoleted by RFC 6376 | Proposed Standard | May 2007 |
| 4865 | SMTP Submission Service Extension for Future Message ReleaseG. White, G. Vaudreuil | Proposed Standard | May 2007 |
| 4848 | Domain-Based Application Service Location Using URIs and the Dynamic Delegation Discovery Service (DDDS)L. Daigle | Proposed Standard | April 2007 |
| 4825 | The Extensible Markup Language (XML) Configuration Access Protocol (XCAP)J. Rosenberg | Proposed Standard | May 2007 |
| 4823 | FTP Transport for Secure Peer-to-Peer Business Data Interchange over the InternetT. Harding, R. Scott | Informational | April 2007 |
| 4796 | The Session Description Protocol (SDP) Content AttributeJ. Hautakorpi, G. Camarillo | Proposed Standard | February 2007 |
| 4792 | Encoding Instructions for the Generic String Encoding Rules (GSER)S. Legg | Proposed Standard | January 2007 |
| 4790 | Internet Application Protocol Collation RegistryC. Newman, M. Duerst, A. Gulbrandsen | Proposed Standard | March 2007 |
| 4770 | vCard Extensions for Instant Messaging (IM)C. Jennings, J. Reschke, Ed. · obsoleted by RFC 6350 | Proposed Standard | January 2007 |
| 4759 | The ENUM Dip Indicator Parameter for the "tel" URIR. Stastny, R. Shockey, L. Conroy | Proposed Standard | December 2006 |
| 4731 | IMAP4 Extension to SEARCH Command for Controlling What Kind of Information Is ReturnedA. Melnikov, D. Cridland | Proposed Standard | November 2006 |
| 4730 | A Session Initiation Protocol (SIP) Event Package for Key Press Stimulus (KPML)E. Burger, M. Dolly | Proposed Standard | November 2006 |
| 4715 | The Integrated Services Digital Network (ISDN) Subaddress Encoding Type for tel URIM. Munakata, S. Schubert, T. Ohba | Informational | November 2006 |
| 4707 | Netnews Administration System (NAS)P. Grau, V. Heinau, H. Schlichting, R. Schuettler | Experimental | October 2006 |
| 4695 | RTP Payload Format for MIDIJ. Lazzaro, J. Wawrzynek · obsoleted by RFC 6295 | Proposed Standard | November 2006 |
| 4694 | Number Portability Parameters for the "tel" URIJ. Yu | Proposed Standard | October 2006 |
| 4688 | A Uniform Resource Name (URN) Namespace for Aerospace and Defence Industries Association of Europe (ASD) Specification 1000DS. Rushing | Informational | October 2006 |
| 4661 | An Extensible Markup Language (XML)-Based Format for Event Notification FilteringH. Khartabil, E. Leppanen, M. Lonnfors, J. Costa-Requena | Proposed Standard | September 2006 |
| 4647 | Matching of Language TagsA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2006 |
| 4646 | Tags for Identifying LanguagesA. Phillips, M. Davis · obsoleted by RFC 5646 | Best Current Practice | September 2006 |
| 4644 | Network News Transfer Protocol (NNTP) Extension for Streaming FeedsJ. Vinocur, K. Murchison | Proposed Standard | October 2006 |
| 4643 | Network News Transfer Protocol (NNTP) Extension for AuthenticationJ. Vinocur, K. Murchison | Proposed Standard | October 2006 |
| 4642 | Using Transport Layer Security (TLS) with Network News Transfer Protocol (NNTP)K. Murchison, J. Vinocur, C. Newman | Proposed Standard | October 2006 |
| 4627 | The application/json Media Type for JavaScript Object Notation (JSON)D. Crockford · obsoleted by RFC 7159 | Informational | July 2006 |
| 4622 | Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP)P. Saint-Andre · obsoleted by RFC 5122 | Proposed Standard | August 2006 |
| 4617 | A Uniform Resource Name (URN) Formal Namespace for the Latvian National Government Integration ProjectJ. Kornijenko | Informational | August 2006 |
| 4616 | The PLAIN Simple Authentication and Security Layer (SASL) MechanismK. Zeilenga, Ed. | Proposed Standard | August 2006 |
| 4583 | Session Description Protocol (SDP) Format for Binary Floor Control Protocol (BFCP) StreamsG. Camarillo · obsoleted by RFC 8856 | Proposed Standard | November 2006 |
| 4582 | The Binary Floor Control Protocol (BFCP)G. Camarillo, J. Ott, K. Drage · obsoleted by RFC 8855 | Proposed Standard | November 2006 |
| 4574 | The Session Description Protocol (SDP) Label AttributeO. Levin, G. Camarillo | Proposed Standard | August 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 |
| 4570 | Session Description Protocol (SDP) Source FiltersB. Quinn, R. Finlayson | Proposed Standard | July 2006 |
| 4568 | Session Description Protocol (SDP) Security Descriptions for Media StreamsF. Andreasen, M. Baugher, D. Wing | Proposed Standard | July 2006 |
| 4567 | Key Management Extensions for Session Description Protocol (SDP) and Real Time Streaming Protocol (RTSP)J. Arkko, F. Lindholm, M. Naslund, K. Norrman, E. Carrara | Proposed Standard | July 2006 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 4551 | IMAP Extension for Conditional STORE Operation or Quick Flag Changes ResynchronizationA. Melnikov, S. Hole · obsoleted by RFC 7162 | Proposed Standard | June 2006 |
| 4529 | Requesting Attributes by Object Class in the Lightweight Directory Access ProtocolK. Zeilenga | Informational | June 2006 |
| 4525 | Lightweight Directory Access Protocol (LDAP) Modify-Increment ExtensionK. Zeilenga | Informational | June 2006 |
| 4523 | Lightweight Directory Access Protocol (LDAP) Schema Definitions for X.509 CertificatesK. Zeilenga | Proposed Standard | June 2006 |
| 4521 | Considerations for Lightweight Directory Access Protocol (LDAP) ExtensionsK. Zeilenga | Best Current Practice | June 2006 |
| 4520 | Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)K. Zeilenga | Best Current Practice | June 2006 |
| 4519 | Lightweight Directory Access Protocol (LDAP): Schema for User ApplicationsA. Sciberras, Ed. | Proposed Standard | June 2006 |
| 4517 | Lightweight Directory Access Protocol (LDAP): Syntaxes and Matching RulesS. Legg, Ed. | Proposed Standard | June 2006 |
| 4516 | Lightweight Directory Access Protocol (LDAP): Uniform Resource LocatorM. Smith, Ed., T. Howes | Proposed Standard | June 2006 |
| 4515 | Lightweight Directory Access Protocol (LDAP): String Representation of Search FiltersM. Smith, Ed., T. Howes | Proposed Standard | June 2006 |
| 4514 | Lightweight Directory Access Protocol (LDAP): String Representation of Distinguished NamesK. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4513 | Lightweight Directory Access Protocol (LDAP): Authentication Methods and Security MechanismsR. Harrison, Ed. | Proposed Standard | June 2006 |
| 4512 | Lightweight Directory Access Protocol (LDAP): Directory Information ModelsK. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4511 | Lightweight Directory Access Protocol (LDAP): The ProtocolJ. Sermersheim, Ed. | Proposed Standard | June 2006 |
| 4505 | Anonymous Simple Authentication and Security Layer (SASL) MechanismK. Zeilenga | Proposed Standard | June 2006 |
| 4501 | Domain Name System Uniform Resource IdentifiersS. Josefsson | Proposed Standard | May 2006 |
| 4485 | Guidelines for Authors of Extensions to the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne | Informational | May 2006 |
| 4479 | A Data Model for PresenceJ. Rosenberg | Proposed Standard | July 2006 |
| 4474 | Enhancements for Authenticated Identity Management in the Session Initiation Protocol (SIP)J. Peterson, C. Jennings · obsoleted by RFC 8224 | Proposed Standard | August 2006 |
| 4469 | Internet Message Access Protocol (IMAP) CATENATE ExtensionP. Resnick | Proposed Standard | April 2006 |
| 4468 | Message Submission BURL ExtensionC. Newman | Proposed Standard | May 2006 |
| 4467 | Internet Message Access Protocol (IMAP) - URLAUTH ExtensionM. Crispin | Proposed Standard | May 2006 |
| 4466 | Collected Extensions to IMAP4 ABNFA. Melnikov, C. Daboo | Proposed Standard | April 2006 |
| 4464 | Signaling Compression (SigComp) Users' GuideA. Surtees, M. West | Informational | May 2006 |
| 4463 | A Media Resource Control Protocol (MRCP) Developed by Cisco, Nuance, and SpeechworksS. Shanmugham, P. Monaco, B. Eberman | Informational | April 2006 |
| 4458 | Session Initiation Protocol (SIP) URIs for Applications such as Voicemail and Interactive Voice Response (IVR)C. Jennings, F. Audet, J. Elwell | Informational | April 2006 |
| 4457 | The Session Initiation Protocol (SIP) P-User-Database Private-Header (P-Header)G. Camarillo, G. Blanco | Informational | April 2006 |
| 4452 | The "info" URI Scheme for Information Assets with Identifiers in Public NamespacesH. Van de Sompel, T. Hammond, E. Neylon, S. Weibel | Informational | April 2006 |
| 4422 | Simple Authentication and Security Layer (SASL)A. Melnikov, Ed., K. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4408 | Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1M. Wong, W. Schlitt · obsoleted by RFC 7208 | Experimental | April 2006 |
| 4405 | SMTP Service Extension for Indicating the Responsible Submitter of an E-Mail MessageE. Allman, H. Katz | Historic | April 2006 |
| 4324 | Calendar Access Protocol (CAP)D. Royer, G. Babics, S. Mansour | Experimental | December 2005 |
| 4315 | Internet Message Access Protocol (IMAP) - UIDPLUS extensionM. Crispin | Proposed Standard | December 2005 |
| 4314 | IMAP4 Access Control List (ACL) ExtensionA. Melnikov | Proposed Standard | December 2005 |
| 4288 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin · obsoleted by RFC 6838 | Best Current Practice | December 2005 |
| 4284 | Identity Selection Hints for the Extensible Authentication Protocol (EAP)F. Adrangi, V. Lortz, F. Bari, P. Eronen | Informational | January 2006 |
| 4282 | The Network Access IdentifierB. Aboba, M. Beadles, J. Arkko, P. Eronen · obsoleted by RFC 7542 | Proposed Standard | December 2005 |
| 4249 | Implementer-Friendly Specification of Message and MIME-Part Header Fields and Field ComponentsB. Lilly | Informational | January 2006 |
| 4240 | Basic Network Media Services with SIPE. Burger, Ed., J. Van Dyke, A. Spitzer | Informational | December 2005 |
| 4198 | A Uniform Resource Name (URN) Namespace for Federated ContentD. Tessman | Informational | November 2005 |
| 4141 | SMTP and MIME Extensions for Content ConversionK. Toyoda, D. Crocker | Proposed Standard | November 2005 |
| 3977 | Network News Transfer Protocol (NNTP)C. Feather | Proposed Standard | October 2006 |
| 3659 | Extensions to FTPP. Hethmon | Proposed Standard | March 2007 |