| 9710 | Simple Fixes to the IP Flow Information Export (IPFIX) Entities IANA RegistryM. Boucadair, B. Claise | Proposed Standard | February 2025 |
| 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 |
| 5792 | PA-TNC: A Posture Attribute (PA) Protocol Compatible with Trusted Network Connect (TNC)P. Sangster, K. Narayan | Proposed Standard | March 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 |
| 5610 | Exporting Type Information for IP Flow Information Export (IPFIX) Information ElementsE. Boschi, B. Trammell, L. Mark, T. Zseby | Proposed Standard | July 2009 |
| 5466 | IMAP4 Extension for Named Searches (Filters)A. Melnikov, C. King | Proposed Standard | February 2009 |
| 5424 | The Syslog ProtocolR. Gerhards | Proposed Standard | March 2009 |
| 5337 | Internationalized Delivery Status and Disposition NotificationsC. Newman, A. Melnikov, Ed. · obsoleted by RFC 6533 | Experimental | September 2008 |
| 5255 | Internet Message Access Protocol InternationalizationC. Newman, A. Gulbrandsen, A. Melnikov | Proposed Standard | June 2008 |
| 5196 | Session Initiation Protocol (SIP) User Agent Capability Extension to Presence Information Data Format (PIDF)M. Lonnfors, K. Kiss | Proposed Standard | September 2008 |
| 5141 | A Uniform Resource Name (URN) Namespace for the International Organization for Standardization (ISO)J. Goodwin, H. Apel | Informational | March 2008 |
| 5139 | Revised Civic Location Format for Presence Information Data Format Location Object (PIDF-LO)M. Thomson, J. Winterbottom | Proposed Standard | February 2008 |
| 5132 | IP Multicast MIBD. McWalter, D. Thaler, A. Kessler | Proposed Standard | December 2007 |
| 5131 | A MIB Textual Convention for Language TagsD. McWalter, Ed. | Proposed Standard | December 2007 |
| 5070 | The Incident Object Description Exchange FormatR. Danyliw, J. Meijer, Y. Demchenko · obsoleted by RFC 7970 | Proposed Standard | December 2007 |
| 5013 | The Dublin Core Metadata Element SetJ. Kunze, T. Baker | Informational | August 2007 |
| 4819 | Secure Shell Public Key SubsystemJ. Galbraith, J. Van Dyke, J. Bright | Proposed Standard | March 2007 |
| 4790 | Internet Application Protocol Collation RegistryC. Newman, M. Duerst, A. Gulbrandsen | Proposed Standard | March 2007 |
| 4765 | The Intrusion Detection Message Exchange Format (IDMEF)H. Debar, D. Curry, B. Feinstein | Experimental | March 2007 |
| 4690 | Review and Recommendations for Internationalized Domain Names (IDNs)J. Klensin, P. Faltstrom, C. Karp, IAB | Informational | September 2006 |
| 4647 | Matching of Language TagsA. Phillips, Ed., M. Davis, Ed. | Best Current Practice | September 2006 |
| 4645 | Initial Language Subtag RegistryD. Ewell | Informational | September 2006 |
| 3659 | Extensions to FTPP. Hethmon | Proposed Standard | March 2007 |