| 9298 | Proxying UDP in HTTPD. Schinazi | Proposed Standard | August 2022 |
| 5793 | PB-TNC: A Posture Broker (PB) Protocol Compatible with Trusted Network Connect (TNC)R. Sahita, S. Hanna, R. Hurst, K. Narayan | Proposed Standard | March 2010 |
| 4896 | Signaling Compression (SigComp) Corrections and ClarificationsA. Surtees, M. West, A.B. Roach | Proposed Standard | June 2007 |
| 4688 | A Uniform Resource Name (URN) Namespace for Aerospace and Defence Industries Association of Europe (ASD) Specification 1000DS. Rushing | Informational | October 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 |
| 4234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell · obsoleted by RFC 5234 | Draft Standard | October 2005 |
| 4183 | A Suggested Scheme for DNS Resolution of Networks and GatewaysE. Warnicke | Informational | September 2005 |
| 4180 | Common Format and MIME Type for Comma-Separated Values (CSV) FilesY. Shafranovich | Informational | October 2005 |
| 4179 | Using Universal Content Identifier (UCI) as Uniform Resource Names (URN)S. Kang | Informational | October 2005 |
| 4168 | The Stream Control Transmission Protocol (SCTP) as a Transport for the Session Initiation Protocol (SIP)J. Rosenberg, H. Schulzrinne, G. Camarillo | Proposed Standard | October 2005 |
| 4151 | The 'tag' URI SchemeT. Kindberg, S. Hawke | Informational | October 2005 |
| 4130 | MIME-Based Secure Peer-to-Peer Business Data Interchange Using HTTP, Applicability Statement 2 (AS2)D. Moberg, R. Drummond | Proposed Standard | July 2005 |
| 4122 | A Universally Unique IDentifier (UUID) URN NamespaceP. Leach, M. Mealling, R. Salz · obsoleted by RFC 9562 | Proposed Standard | July 2005 |
| 4088 | Uniform Resource Identifier (URI) Scheme for the Simple Network Management Protocol (SNMP)D. Black, K. McCloghrie, J. Schoenwaelder | Proposed Standard | June 2005 |
| 4037 | Open Pluggable Edge Services (OPES) Callout Protocol (OCP) CoreA. Rousskov | Proposed Standard | March 2005 |
| 4004 | Diameter Mobile IPv4 ApplicationP. Calhoun, T. Johansson, C. Perkins, T. Hiller, Ed., P. McCann | Proposed Standard | August 2005 |
| 3987 | Internationalized Resource Identifiers (IRIs)M. Duerst, M. Suignard | Proposed Standard | January 2005 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 3983 | Using the Internet Registry Information Service (IRIS) over the Blocks Extensible Exchange Protocol (BEEP)A. Newton, M. Sanz | Proposed Standard | January 2005 |
| 3981 | IRIS: The Internet Registry Information Service (IRIS) Core ProtocolA. Newton, M. Sanz | Proposed Standard | January 2005 |
| 3966 | The tel URI for Telephone NumbersH. Schulzrinne | Proposed Standard | December 2004 |
| 3958 | Domain-Based Application Service Location Using SRV RRs and the Dynamic Delegation Discovery Service (DDDS)L. Daigle, A. Newton | Proposed Standard | January 2005 |
| 3939 | Calling Line Identification for Voice Mail MessagesG. Parsons, J. Maruszak | Proposed Standard | December 2004 |
| 3920 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre, Ed. · obsoleted by RFC 6120 | Proposed Standard | October 2004 |
| 3911 | The Session Initiation Protocol (SIP) "Join" HeaderR. Mahy, D. Petrie | Proposed Standard | October 2004 |
| 3903 | Session Initiation Protocol (SIP) Extension for Event State PublicationA. Niemi, Ed. | Proposed Standard | November 2004 |
| 3891 | The Session Initiation Protocol (SIP) "Replaces" HeaderR. Mahy, B. Biggs, R. Dean | Proposed Standard | September 2004 |
| 3890 | A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)M. Westerlund | Proposed Standard | September 2004 |
| 3887 | Message Tracking Query ProtocolT. Hansen | Proposed Standard | September 2004 |
| 3886 | An Extensible Message Format for Message Tracking ResponsesE. Allman | Proposed Standard | September 2004 |
| 3885 | SMTP Service Extension for Message TrackingE. Allman, T. Hansen | Proposed Standard | September 2004 |
| 3876 | Returning Matched Values with the Lightweight Directory Access Protocol version 3 (LDAPv3)D. Chadwick, S. Mullan | Proposed Standard | September 2004 |
| 3866 | Language Tags and Ranges in the Lightweight Directory Access Protocol (LDAP)K. Zeilenga, Ed. | Proposed Standard | July 2004 |
| 3865 | A No Soliciting Simple Mail Transfer Protocol (SMTP) Service ExtensionC. Malamud | Proposed Standard | September 2004 |
| 3862 | Common Presence and Instant Messaging (CPIM): Message FormatG. Klyne, D. Atkins | Proposed Standard | August 2004 |
| 3842 | A Message Summary and Message Waiting Indication Event Package for the Session Initiation Protocol (SIP)R. Mahy | Proposed Standard | August 2004 |
| 3834 | Recommendations for Automatic Responses to Electronic MailK. Moore | Proposed Standard | August 2004 |
| 3804 | Voice Profile for Internet Mail (VPIM) AddressingG. Parsons | Proposed Standard | June 2004 |
| 3795 | Survey of IPv4 Addresses in Currently Deployed IETF Application Area Standards Track and Experimental DocumentsR. Sofia, P. Nesser, II | Informational | June 2004 |
| 3781 | Next Generation Structure of Management Information (SMIng) Mappings to the Simple Network Management Protocol (SNMP)F. Strauss, J. Schoenwaelder | Experimental | May 2004 |
| 3780 | SMIng - Next Generation Structure of Management InformationF. Strauss, J. Schoenwaelder | Experimental | May 2004 |
| 3743 | Joint Engineering Team (JET) Guidelines for Internationalized Domain Names (IDN) Registration and Administration for Chinese, Japanese, and KoreanK. Konishi, K. Huang, H. Qian, Y. Ko | Informational | April 2004 |
| 3691 | Internet Message Access Protocol (IMAP) UNSELECT commandA. Melnikov | Proposed Standard | February 2004 |
| 3687 | Lightweight Directory Access Protocol (LDAP) and X.500 Component Matching RulesS. Legg | Proposed Standard | February 2004 |
| 3676 | The Text/Plain Format and DelSp ParametersR. Gellens | Proposed Standard | February 2004 |
| 3672 | Subentries in the Lightweight Directory Access Protocol (LDAP)K. Zeilenga | Proposed Standard | December 2003 |
| 3656 | The Mailbox Update (MUPDATE) Distributed Mailbox Database ProtocolR. Siemborski | Experimental | December 2003 |
| 3651 | Handle System Namespace and Service DefinitionS. Sun, S. Reilly, L. Lannom | Informational | November 2003 |
| 3642 | Common Elements of Generic String Encoding Rules (GSER) EncodingsS. Legg | Informational | October 2003 |
| 3641 | Generic String Encoding Rules (GSER) for ASN.1 TypesS. Legg | Proposed Standard | October 2003 |
| 3632 | VeriSign Registry Registrar Protocol (RRP) Version 2.0.0S. Hollenbeck, S. Veeramachaneni, S. Yalamanchilli | Informational | December 2003 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 3625 | The QCP File Format and Media Types for Speech DataR. Gellens, H. Garudadri | Informational | October 2003 |
| 3624 | The Media Gateway Control Protocol (MGCP) Bulk Audit PackageB. Foster, D. Auerbach, F. Andreasen | Informational | November 2003 |
| 3622 | A Uniform Resource Name (URN) Namespace for the Liberty Alliance ProjectM. Mealling | Informational | February 2004 |
| 3617 | Uniform Resource Identifier (URI) Scheme and Applicability Statement for the Trivial File Transfer Protocol (TFTP)E. Lear | Informational | October 2003 |
| 3613 | Definition of a Uniform Resource Name (URN) Namespace for the Middleware Architecture Committee for Education (MACE)R. Morgan, K. Hazelton | Informational | November 2003 |
| 3611 | RTP Control Protocol Extended Reports (RTCP XR)T. Friedman, Ed., R. Caceres, Ed., A. Clark, Ed. | Proposed Standard | November 2003 |
| 3605 | Real Time Control Protocol (RTCP) attribute in Session Description Protocol (SDP)C. Huitema | Proposed Standard | October 2003 |
| 3603 | Private Session Initiation Protocol (SIP) Proxy-to-Proxy Extensions for Supporting the PacketCable Distributed Call Signaling ArchitectureW. Marshall, Ed., F. Andreasen, Ed. · obsoleted by RFC 5503 | Informational | October 2003 |
| 3601 | Text String Notation for Dial Sequences and Global Switched Telephone Network (GSTN) / E.164 AddressesC. Allocchio | Proposed Standard | September 2003 |
| 3588 | Diameter Base ProtocolP. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko · obsoleted by RFC 6733 | Proposed Standard | September 2003 |
| 3525 | Gateway Control Protocol Version 1C. Groves, Ed., M. Pantaleo, Ed., T. Anderson, Ed., T. Taylor, Ed. · obsoleted by RFC 5125 | Historic | June 2003 |
| 3516 | IMAP4 Binary Content ExtensionL. Nerenberg | Proposed Standard | April 2003 |
| 3510 | Internet Printing Protocol/1.1: IPP URL SchemeR. Herriot, I. McDonald | Proposed Standard | April 2003 |
| 3508 | H.323 Uniform Resource Locator (URL) Scheme RegistrationO. Levin | Informational | April 2003 |
| 3502 | Internet Message Access Protocol (IMAP) - MULTIAPPEND ExtensionM. Crispin | Proposed Standard | March 2003 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 3470 | Guidelines for the Use of Extensible Markup Language (XML) within IETF ProtocolsS. Hollenbeck, M. Rose, L. Masinter | Best Current Practice | January 2003 |
| 3460 | Policy Core Information Model (PCIM) ExtensionsB. Moore, Ed. | Proposed Standard | January 2003 |
| 3459 | Critical Content Multi-purpose Internet Mail Extensions (MIME) ParameterE. Burger | Proposed Standard | January 2003 |
| 3458 | Message Context for Internet MailE. Burger, E. Candell, C. Eliot, G. Klyne | Proposed Standard | January 2003 |
| 3455 | Private Header (P-Header) Extensions to the Session Initiation Protocol (SIP) for the 3rd-Generation Partnership Project (3GPP)M. Garcia-Martin, E. Henrikson, D. Mills · obsoleted by RFC 7315 | Informational | January 2003 |
| 3441 | Asynchronous Transfer Mode (ATM) Package for the Media Gateway Control Protocol (MGCP)R. Kumar | Informational | January 2003 |
| 3435 | Media Gateway Control Protocol (MGCP) Version 1.0F. Andreasen, B. Foster | Informational | January 2003 |
| 3431 | Sieve Extension: Relational TestsW. Segmuller · obsoleted by RFC 5231 | Proposed Standard | December 2002 |
| 3421 | Select and Sort Extensions for the Service Location Protocol (SLP)W. Zhao, H. Schulzrinne, E. Guttman, C. Bisdikian, W. Jerome | Experimental | November 2002 |
| 3420 | Internet Media Type message/sipfragR. Sparks | Proposed Standard | November 2002 |
| 3403 | Dynamic Delegation Discovery System (DDDS) Part Three: The Domain Name System (DNS) DatabaseM. Mealling | Proposed Standard | October 2002 |
| 3391 | The MIME Application/Vnd.pwg-multiplexed Content-TypeR. Herriot | Informational | December 2002 |
| 3383 | Internet Assigned Numbers Authority (IANA) Considerations for the Lightweight Directory Access Protocol (LDAP)K. Zeilenga · obsoleted by RFC 4520 | Best Current Practice | September 2002 |
| 3368 | The 'go' URI Scheme for the Common Name Resolution ProtocolM. Mealling | Proposed Standard | August 2002 |
| 3348 | The Internet Message Action Protocol (IMAP4) Child Mailbox ExtensionM. Gahrns, R. Cheng | Informational | July 2002 |
| 3340 | The Application Exchange CoreM. Rose, G. Klyne, D. Crocker | Historic | July 2002 |
| 3339 | Date and Time on the Internet: TimestampsG. Klyne, C. Newman | Proposed Standard | July 2002 |
| 3325 | Private Extensions to the Session Initiation Protocol (SIP) for Asserted Identity within Trusted NetworksC. Jennings, J. Peterson, M. Watson | Informational | December 2002 |
| 3313 | Private Session Initiation Protocol (SIP) Extensions for Media AuthorizationW. Marshall, Ed. | Informational | January 2003 |
| 3297 | Content Negotiation for Messaging Services based on EmailG. Klyne, R. Iwazaki, D. Crocker | Proposed Standard | July 2002 |
| 3282 | Content Language HeadersH. Alvestrand | Draft Standard | May 2002 |
| 3266 | Support for IPv6 in Session Description Protocol (SDP)S. Olson, G. Camarillo, A. B. Roach · obsoleted by RFC 4566 | Proposed Standard | July 2002 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3259 | A Message Bus for Local CoordinationJ. Ott, C. Perkins, D. Kutscher | Informational | May 2002 |
| 3192 | Minimal FAX address format in Internet MailC. Allocchio | Draft Standard | October 2001 |
| 3191 | Minimal GSTN address format in Internet MailC. Allocchio | Draft Standard | October 2001 |
| 3179 | Script MIB Extensibility Protocol Version 1.1J. Schoenwaelder, J. Quittek | Experimental | October 2001 |
| 3164 | The BSD Syslog ProtocolC. Lonvick · obsoleted by RFC 5424 | Informational | August 2001 |
| 3112 | LDAP Authentication Password SchemaK. Zeilenga | Informational | May 2001 |
| 3108 | Conventions for the use of the Session Description Protocol (SDP) for ATM Bearer ConnectionsR. Kumar, M. Mostafa | Proposed Standard | May 2001 |
| 3091 | Pi Digit Generation ProtocolH. Kennedy | Informational | 1 April 2001 |
| 3085 | URN Namespace for NewsML ResourcesA. Coates, D. Allen, D. Rivers-Moore | Informational | March 2001 |
| 3084 | COPS Usage for Policy Provisioning (COPS-PR)K. Chan, J. Seligson, D. Durham, S. Gai, K. McCloghrie, S. Herzog, F. Reichmeyer, R. Yavatkar, A. Smith | Historic | March 2001 |
| 3082 | Notification and Subscription for SLPJ. Kempf, J. Goldschmidt | Experimental | March 2001 |
| 3081 | Mapping the BEEP Core onto TCPM. Rose | Proposed Standard | March 2001 |
| 3080 | The Blocks Extensible Exchange Protocol CoreM. Rose | Proposed Standard | March 2001 |
| 3066 | Tags for the Identification of LanguagesH. Alvestrand · obsoleted by RFC 4646, RFC 4647 | Best Current Practice | January 2001 |
| 3028 | Sieve: A Mail Filtering LanguageT. Showalter · obsoleted by RFC 5228, RFC 5429 | Proposed Standard | January 2001 |
| 3018 | Unified Memory Space Protocol SpecificationA. Bogdanov | Experimental | December 2000 |
| 3015 | Megaco Protocol Version 1.0F. Cuervo, N. Greene, A. Rayhan, C. Huitema, B. Rosen, J. Segers · obsoleted by RFC 3525 | Proposed Standard | November 2000 |
| 2985 | PKCS #9: Selected Object Classes and Attribute Types Version 2.0M. Nystrom, B. Kaliski | Informational | November 2000 |
| 2967 | TISDAG - Technical Infrastructure for Swedish Directory Access GatewaysL. Daigle, R. Hedberg | Informational | October 2000 |
| 2958 | The application/whoispp-response Content-typeL. Daigle, P. Faltstrom | Informational | October 2000 |
| 2957 | The application/whoispp-query Content-TypeL. Daigle, P. Faltstrom | Informational | October 2000 |
| 2938 | Identifying Composite Media FeaturesG. Klyne, L. Masinter | Proposed Standard | September 2000 |
| 2926 | Conversion of LDAP Schemas to and from SLP TemplatesJ. Kempf, R. Moats, P. St. Pierre | Informational | September 2000 |
| 2919 | List-Id: A Structured Field and Namespace for the Identification of Mailing ListsR. Chandhok, G. Wenger | Proposed Standard | March 2001 |
| 2915 | The Naming Authority Pointer (NAPTR) DNS Resource RecordM. Mealling, R. Daniel · obsoleted by RFC 3401, RFC 3402, RFC 3403, RFC 3404 | Proposed Standard | September 2000 |
| 2913 | MIME Content Types in Media Feature ExpressionsG. Klyne | Proposed Standard | September 2000 |
| 2912 | Indicating Media Features for MIME ContentG. Klyne | Proposed Standard | September 2000 |
| 2910 | Internet Printing Protocol/1.1: Encoding and TransportR. Herriot, Ed., S. Butler, P. Moore, R. Turner, J. Wenn · obsoleted by RFC 8010 | Proposed Standard | September 2000 |
| 2885 | Megaco Protocol version 0.8F. Cuervo, N. Greene, C. Huitema, A. Rayhan, B. Rosen, J. Segers · obsoleted by RFC 3015 | Historic | August 2000 |
| 2852 | Deliver By SMTP Service ExtensionD. Newman | Proposed Standard | June 2000 |
| 2849 | The LDAP Data Interchange Format (LDIF) - Technical SpecificationG. Good | Proposed Standard | June 2000 |
| 2848 | The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call ServicesS. Petrack, L. Conroy | Proposed Standard | June 2000 |
| 2846 | GSTN Address Element Extensions in E-mail ServicesC. Allocchio | Proposed Standard | June 2000 |
| 2832 | NSI Registry Registrar Protocol (RRP) Version 1.1.0S. Hollenbeck, M. Srivastava | Informational | May 2000 |
| 2829 | Authentication Methods for LDAPM. Wahl, H. Alvestrand, J. Hodges, R. Morgan · obsoleted by RFC 4510, RFC 4513 | Proposed Standard | May 2000 |
| 2822 | Internet Message FormatP. Resnick, Ed. · obsoleted by RFC 5322 | Proposed Standard | April 2001 |
| 2821 | Simple Mail Transfer ProtocolJ. Klensin, Ed. · obsoleted by RFC 5321 | Proposed Standard | April 2001 |
| 2813 | Internet Relay Chat: Server ProtocolC. Kalt | Informational | April 2000 |
| 2812 | Internet Relay Chat: Client ProtocolC. Kalt | Informational | April 2000 |
| 2808 | The SecurID(r) SASL MechanismM. Nystrom | Informational | April 2000 |
| 2806 | URLs for Telephone CallsA. Vaha-Sipila · obsoleted by RFC 3966 | Proposed Standard | April 2000 |
| 2738 | Corrections to "A Syntax for Describing Media Feature Sets"G. Klyne | Proposed Standard | December 1999 |
| 2705 | Media Gateway Control Protocol (MGCP) Version 1.0M. Arango, A. Dugan, I. Elliott, C. Huitema, S. Pickett · obsoleted by RFC 3435 | Informational | October 1999 |
| 2673 | Binary Labels in the Domain Name SystemM. Crawford · obsoleted by RFC 6891 | Historic | August 1999 |
| 2653 | CIP Transport ProtocolsJ. Allen, P. Leach, R. Hedberg | Proposed Standard | August 1999 |
| 2648 | A URN Namespace for IETF DocumentsR. Moats | Informational | August 1999 |
| 2646 | The Text/Plain Format ParameterR. Gellens, Ed. · obsoleted by RFC 3676 | Proposed Standard | August 1999 |
| 2645 | ON-DEMAND MAIL RELAY (ODMR) SMTP with Dynamic IP AddressesR. Gellens | Proposed Standard | August 1999 |
| 2640 | Internationalization of the File Transfer ProtocolB. Curtin | Proposed Standard | July 1999 |
| 2614 | An API for Service LocationJ. Kempf, E. Guttman | Informational | June 1999 |
| 2609 | Service Templates and Service: SchemesE. Guttman, C. Perkins, J. Kempf | Proposed Standard | June 1999 |
| 2608 | Service Location Protocol, Version 2E. Guttman, C. Perkins, J. Veizades, M. Day | Proposed Standard | June 1999 |
| 2595 | Using TLS with IMAP, POP3 and ACAPC. Newman | Proposed Standard | June 1999 |
| 2593 | Script MIB Extensibility Protocol Version 1.0J. Schoenwaelder, J. Quittek · obsoleted by RFC 3179 | Experimental | May 1999 |
| 2569 | Mapping between LPD and IPP ProtocolsR. Herriot, Ed., T. Hastings, N. Jacobs, J. Martin | Experimental | April 1999 |
| 2565 | Internet Printing Protocol/1.0: Encoding and TransportR. Herriot, Ed., S. Butler, P. Moore, R. Turner · obsoleted by RFC 2910 | Experimental | April 1999 |
| 2557 | MIME Encapsulation of Aggregate Documents, such as HTML (MHTML)J. Palme, A. Hopmann, N. Shelness | Proposed Standard | March 1999 |
| 2554 | SMTP Service Extension for AuthenticationJ. Myers · obsoleted by RFC 4954 | Proposed Standard | March 1999 |
| 2550 | Y10K and BeyondS. Glassman, M. Manasse, J. Mogul | Informational | 1 April 1999 |
| 2533 | A Syntax for Describing Media Feature SetsG. Klyne | Proposed Standard | March 1999 |
| 2530 | Indicating Supported Media Features Using Extensions to DSN and MDND. Wing | Proposed Standard | March 1999 |
| 2506 | Media Feature Tag Registration ProcedureK. Holtman, A. Mutz, T. Hardie | Best Current Practice | March 1999 |
| 2486 | The Network Access IdentifierB. Aboba, M. Beadles · obsoleted by RFC 4282 | Proposed Standard | January 1999 |
| 2476 | Message SubmissionR. Gellens, J. Klensin · obsoleted by RFC 4409 | Proposed Standard | December 1998 |
| 2449 | POP3 Extension MechanismR. Gellens, C. Newman, L. Lundblade | Proposed Standard | November 1998 |
| 2445 | Internet Calendaring and Scheduling Core Object Specification (iCalendar)F. Dawson, D. Stenerson · obsoleted by RFC 5545 | Proposed Standard | November 1998 |
| 2426 | vCard MIME Directory ProfileF. Dawson, T. Howes · obsoleted by RFC 6350 | Proposed Standard | September 1998 |
| 2425 | A MIME Content-Type for Directory InformationT. Howes, M. Smith, F. Dawson · obsoleted by RFC 6350 | Proposed Standard | September 1998 |
| 2389 | Feature negotiation mechanism for the File Transfer ProtocolP. Hethmon, R. Elz | Proposed Standard | August 1998 |
| 2384 | POP URL SchemeR. Gellens | Proposed Standard | August 1998 |
| 2373 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering · obsoleted by RFC 3513 | Proposed Standard | July 1998 |
| 2345 | Domain Names and Company Name RetrievalJ. Klensin, T. Wolf, G. Oglesby | Experimental | May 1998 |
| 2342 | IMAP4 NamespaceM. Gahrns, C. Newman | Proposed Standard | May 1998 |
| 2327 | SDP: Session Description ProtocolM. Handley, V. Jacobson · obsoleted by RFC 4566 | Proposed Standard | April 1998 |
| 2326 | Real Time Streaming Protocol (RTSP)H. Schulzrinne, A. Rao, R. Lanphier · obsoleted by RFC 7826 | Proposed Standard | April 1998 |
| 2304 | Minimal FAX address format in Internet MailC. Allocchio · obsoleted by RFC 3192 | Proposed Standard | March 1998 |
| 2303 | Minimal PSTN address format in Internet MailC. Allocchio · obsoleted by RFC 3191 | Proposed Standard | March 1998 |
| 2245 | Anonymous SASL MechanismC. Newman · obsoleted by RFC 4505 | Proposed Standard | November 1997 |
| 2244 | ACAP -- Application Configuration Access ProtocolC. Newman, J. G. Myers | Proposed Standard | November 1997 |