| 9399 | Internet X.509 Public Key Infrastructure: Logotypes in X.509 CertificatesS. Santesson, R. Housley, T. Freeman, L. Rosenthol | Proposed Standard | May 2023 |
| 6170 | Internet X.509 Public Key Infrastructure -- Certificate ImageS. Santesson, R. Housley, S. Bajaj, L. Rosenthol · obsoleted by RFC 9399 | Proposed Standard | May 2011 |
| 5912 | New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)P. Hoffman, J. Schaad | Informational | June 2010 |
| 5854 | The Metalink Download Description FormatA. Bryan, T. Tsujikawa, N. McNab, P. Poeml | Proposed Standard | June 2010 |
| 5730 | Extensible Provisioning Protocol (EPP)S. Hollenbeck | Internet Standard | August 2009 |
| 5646 | Tags for Identifying LanguagesA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2009 |
| 5645 | Update to the Language Subtag RegistryD. Ewell, Ed. | Informational | September 2009 |
| 4930 | Extensible Provisioning Protocol (EPP)S. Hollenbeck · obsoleted by RFC 5730 | Draft Standard | May 2007 |
| 4776 | Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration InformationH. Schulzrinne | Proposed Standard | November 2006 |
| 4690 | Review and Recommendations for Internationalized Domain Names (IDNs)J. Klensin, P. Faltstrom, C. Karp, IAB | Informational | September 2006 |
| 4676 | Dynamic Host Configuration Protocol (DHCPv4 and DHCPv6) Option for Civic Addresses Configuration InformationH. Schulzrinne · obsoleted by RFC 4776 | Proposed Standard | October 2006 |
| 4662 | A Session Initiation Protocol (SIP) Event Notification Extension for Resource ListsA. B. Roach, B. Campbell, J. Rosenberg | Proposed Standard | August 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 |
| 4645 | Initial Language Subtag RegistryD. Ewell | Informational | September 2006 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 4504 | SIP Telephony Device Requirements and ConfigurationH. Sinnreich, Ed., S. Lass, C. Stredicke | Informational | May 2006 |
| 4463 | A Media Resource Control Protocol (MRCP) Developed by Cisco, Nuance, and SpeechworksS. Shanmugham, P. Monaco, B. Eberman | Informational | April 2006 |
| 4462 | Generic Security Service Application Program Interface (GSS-API) Authentication and Key Exchange for the Secure Shell (SSH) ProtocolJ. Hutzelman, J. Salowey, J. Galbraith, V. Welch | Proposed Standard | May 2006 |
| 4290 | Suggested Practices for Registration of Internationalized Domain Names (IDN)J. Klensin | Informational | December 2005 |
| 4287 | The Atom Syndication FormatM. Nottingham, Ed., R. Sayre, Ed. | Proposed Standard | December 2005 |
| 4256 | Generic Message Exchange Authentication for the Secure Shell Protocol (SSH)F. Cusack, M. Forssen | Proposed Standard | January 2006 |
| 4254 | The Secure Shell (SSH) Connection ProtocolT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4253 | The Secure Shell (SSH) Transport Layer ProtocolT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4252 | The Secure Shell (SSH) Authentication ProtocolT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4251 | The Secure Shell (SSH) Protocol ArchitectureT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4240 | Basic Network Media Services with SIPE. Burger, Ed., J. Van Dyke, A. Spitzer | Informational | December 2005 |
| 4210 | Internet X.509 Public Key Infrastructure Certificate Management Protocol (CMP)C. Adams, S. Farrell, T. Kause, T. Mononen · obsoleted by RFC 9810 | Proposed Standard | September 2005 |
| 4112 | Electronic Commerce Modeling Language (ECML) Version 2 SpecificationD. Eastlake 3rd | Proposed Standard | June 2005 |
| 4096 | Policy-Mandated Labels Such as "Adv:" in Email Subject Headers Considered Ineffective At BestC. Malamud | Informational | May 2005 |
| 3931 | Layer Two Tunneling Protocol - Version 3 (L2TPv3)J. Lau, Ed., M. Townsley, Ed., I. Goyret, Ed. | Proposed Standard | March 2005 |
| 3920 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre, Ed. · obsoleted by RFC 6120 | Proposed Standard | October 2004 |
| 3880 | Call Processing Language (CPL): A Language for User Control of Internet Telephony ServicesJ. Lennox, X. Wu, H. Schulzrinne | Proposed Standard | November 2004 |
| 3866 | Language Tags and Ranges in the Lightweight Directory Access Protocol (LDAP)K. Zeilenga, Ed. | Proposed Standard | July 2004 |
| 3863 | Presence Information Data Format (PIDF)H. Sugano, S. Fujimoto, G. Klyne, A. Bateman, W. Carr, J. Peterson | Proposed Standard | August 2004 |
| 3862 | Common Presence and Instant Messaging (CPIM): Message FormatG. Klyne, D. Atkins | Proposed Standard | August 2004 |
| 3801 | Voice Profile for Internet Mail - version 2 (VPIMv2)G. Vaudreuil, G. Parsons | Draft Standard | June 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 |
| 3730 | Extensible Provisioning Protocol (EPP)S. Hollenbeck · obsoleted by RFC 4930 | Proposed Standard | March 2004 |
| 3720 | Internet Small Computer Systems Interface (iSCSI)J. Satran, K. Meth, C. Sapuntzakis, M. Chadalapaka, E. Zeidner · obsoleted by RFC 7143 | Proposed Standard | April 2004 |
| 3712 | Lightweight Directory Access Protocol (LDAP): Schema for Printer ServicesP. Fleming, I. McDonald · obsoleted by RFC 7612 | Informational | February 2004 |
| 3709 | Internet X.509 Public Key Infrastructure: Logotypes in X.509 CertificatesS. Santesson, R. Housley, T. Freeman · obsoleted by RFC 9399 | Proposed Standard | February 2004 |
| 3559 | Multicast Address Allocation MIBD. Thaler | Proposed Standard | June 2003 |
| 3536 | Terminology Used in Internationalization in the IETFP. Hoffman · obsoleted by RFC 6365 | Informational | May 2003 |
| 3501 | INTERNET MESSAGE ACCESS PROTOCOL - VERSION 4rev1M. Crispin · obsoleted by RFC 9051 | Proposed Standard | March 2003 |
| 3282 | Content Language HeadersH. Alvestrand | Draft Standard | May 2002 |
| 3253 | Versioning Extensions to WebDAV (Web Distributed Authoring and Versioning)G. Clemm, J. Amsden, T. Ellison, C. Kaler, J. Whitehead | Proposed Standard | March 2002 |
| 3195 | Reliable Delivery for syslogD. New, M. Rose | Proposed Standard | November 2001 |
| 3106 | ECML v1.1: Field Specifications for E-CommerceD. Eastlake 3rd, T. Goldstein | Informational | April 2001 |
| 3080 | The Blocks Extensible Exchange Protocol CoreM. Rose | Proposed Standard | March 2001 |
| 3059 | Attribute List Extension for the Service Location ProtocolE. Guttman | Proposed Standard | February 2001 |