| 5248 | A Registry for SMTP Enhanced Mail System Status CodesT. Hansen, J. Klensin | Best Current Practice | June 2008 |
| 5249 | Templates for Internet-Drafts Containing MIB ModulesD. Harrington, Ed. | Best Current Practice | July 2008 |
| 5250 | The OSPF Opaque LSA OptionL. Berger, I. Bryskin, A. Zinin, R. Coltun | Proposed Standard | July 2008 |
| 5251 | Layer 1 VPN Basic ModeD. Fedyk, Ed., Y. Rekhter, Ed., D. Papadimitriou, R. Rabbat, L. Berger | Proposed Standard | July 2008 |
| 5252 | OSPF-Based Layer 1 VPN Auto-DiscoveryI. Bryskin, L. Berger | Proposed Standard | July 2008 |
| 5253 | Applicability Statement for Layer 1 Virtual Private Network (L1VPN) Basic ModeT. Takeda, Ed. | Informational | July 2008 |
| 5254 | Requirements for Multi-Segment Pseudowire Emulation Edge-to-Edge (PWE3)N. Bitar, Ed., M. Bocci, Ed., L. Martini, Ed. | Informational | October 2008 |
| 5255 | Internet Message Access Protocol InternationalizationC. Newman, A. Gulbrandsen, A. Melnikov | Proposed Standard | June 2008 |
| 5256 | Internet Message Access Protocol - SORT and THREAD ExtensionsM. Crispin, K. Murchison | Proposed Standard | June 2008 |
| 5257 | Internet Message Access Protocol - ANNOTATE ExtensionC. Daboo, R. Gellens | Experimental | June 2008 |
| 5258 | Internet Message Access Protocol version 4 - LIST Command ExtensionsB. Leiba, A. Melnikov | Proposed Standard | June 2008 |
| 5259 | Internet Message Access Protocol - CONVERT ExtensionA. Melnikov, Ed., P. Coates, Ed. | Proposed Standard | July 2008 |
| 5260 | Sieve Email Filtering: Date and Index ExtensionsN. Freed | Proposed Standard | July 2008 |
| 5261 | An Extensible Markup Language (XML) Patch Operations Framework Utilizing XML Path Language (XPath) SelectorsJ. Urpalainen | Proposed Standard | September 2008 |
| 5262 | Presence Information Data Format (PIDF) Extension for Partial PresenceM. Lonnfors, E. Leppanen, H. Khartabil, J. Urpalainen | Proposed Standard | September 2008 |
| 5263 | Session Initiation Protocol (SIP) Extension for Partial Notification of Presence InformationM. Lonnfors, J. Costa-Requena, E. Leppanen, H. Khartabil | Proposed Standard | September 2008 |
| 5264 | Publication of Partial Presence InformationA. Niemi, M. Lonnfors, E. Leppanen | Proposed Standard | September 2008 |
| 5265 | Mobile IPv4 Traversal across IPsec-Based VPN GatewaysS. Vaarala, E. Klovning | Proposed Standard | June 2008 |
| 5266 | Secure Connectivity and Mobility Using Mobile IPv4 and IKEv2 Mobility and Multihoming (MOBIKE)V. Devarapalli, P. Eronen | Best Current Practice | June 2008 |
| 5267 | Contexts for IMAP4D. Cridland, C. King | Proposed Standard | July 2008 |
| 5268 | Mobile IPv6 Fast HandoversR. Koodli, Ed. · obsoleted by RFC 5568 | Proposed Standard | June 2008 |
| 5269 | Distributing a Symmetric Fast Mobile IPv6 (FMIPv6) Handover Key Using SEcure Neighbor Discovery (SEND)J. Kempf, R. Koodli | Proposed Standard | June 2008 |
| 5270 | Mobile IPv6 Fast Handovers over IEEE 802.16e NetworksH. Jang, J. Jee, Y. Han, S. Park, J. Cha | Informational | June 2008 |
| 5271 | Mobile IPv6 Fast Handovers for 3G CDMA NetworksH. Yokota, G. Dommety | Informational | June 2008 |
| 5272 | Certificate Management over CMS (CMC)J. Schaad, M. Myers · obsoleted by RFC 10002 | Proposed Standard | June 2008 |
| 5273 | Certificate Management over CMS (CMC): Transport ProtocolsJ. Schaad, M. Myers · obsoleted by RFC 10003 | Proposed Standard | June 2008 |
| 5274 | Certificate Management Messages over CMS (CMC): Compliance RequirementsJ. Schaad, M. Myers · obsoleted by RFC 10004 | Proposed Standard | June 2008 |
| 5275 | CMS Symmetric Key Management and DistributionS. Turner | Proposed Standard | June 2008 |
| 5276 | Using the Server-Based Certificate Validation Protocol (SCVP) to Convey Long-Term Evidence RecordsC. Wallace | Proposed Standard | August 2008 |
| 5277 | NETCONF Event NotificationsS. Chisholm, H. Trevino | Proposed Standard | July 2008 |
| 5278 | IANA Registration of Enumservices for Voice and Video MessagingJ. Livingood, D. Troshynski | Proposed Standard | July 2008 |
| 5279 | A Uniform Resource Name (URN) Namespace for the 3rd Generation Partnership Project (3GPP)A. Monrad, S. Loreto | Informational | July 2008 |
| 5280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileD. Cooper, S. Santesson, S. Farrell, S. Boeyen, R. Housley, W. Polk | Proposed Standard | May 2008 |
| 5281 | Extensible Authentication Protocol Tunneled Transport Layer Security Authenticated Protocol Version 0 (EAP-TTLSv0)P. Funk, S. Blake-Wilson | Informational | August 2008 |
| 5282 | Using Authenticated Encryption Algorithms with the Encrypted Payload of the Internet Key Exchange version 2 (IKEv2) ProtocolD. Black, D. McGrew | Proposed Standard | August 2008 |
| 5283 | LDP Extension for Inter-Area Label Switched Paths (LSPs)B. Decraene, JL. Le Roux, I. Minei | Proposed Standard | July 2008 |
| 5284 | User-Defined Errors for RSVPG. Swallow, A. Farrel | Proposed Standard | August 2008 |
| 5285 | A General Mechanism for RTP Header ExtensionsD. Singer, H. Desineni · obsoleted by RFC 8285 | Proposed Standard | July 2008 |
| 5286 | Basic Specification for IP Fast Reroute: Loop-Free AlternatesA. Atlas, Ed., A. Zinin, Ed. | Proposed Standard | September 2008 |
| 5287 | Control Protocol Extensions for the Setup of Time-Division Multiplexing (TDM) Pseudowires in MPLS NetworksA. Vainshtein, Y(J). Stein | Proposed Standard | August 2008 |
| 5288 | AES Galois Counter Mode (GCM) Cipher Suites for TLSJ. Salowey, A. Choudhury, D. McGrew | Proposed Standard | August 2008 |
| 5289 | TLS Elliptic Curve Cipher Suites with SHA-256/384 and AES Galois Counter Mode (GCM)E. Rescorla | Proposed Standard | August 2008 |
| 5290 | Comments on the Usefulness of Simple Best-Effort TrafficS. Floyd, M. Allman | Informational | July 2008 |
| 5291 | Outbound Route Filtering Capability for BGP-4E. Chen, Y. Rekhter | Proposed Standard | August 2008 |
| 5292 | Address-Prefix-Based Outbound Route Filter for BGP-4E. Chen, S. Sangli | Proposed Standard | August 2008 |
| 5293 | Sieve Email Filtering: Editheader ExtensionJ. Degener, P. Guenther | Proposed Standard | August 2008 |
| 5294 | Host Threats to Protocol Independent Multicast (PIM)P. Savola, J. Lingard | Informational | August 2008 |
| 5295 | Specification for the Derivation of Root Keys from an Extended Master Session Key (EMSK)J. Salowey, L. Dondeti, V. Narayanan, M. Nakhjiri | Proposed Standard | August 2008 |
| 5296 | EAP Extensions for EAP Re-authentication Protocol (ERP)V. Narayanan, L. Dondeti · obsoleted by RFC 6696 | Proposed Standard | August 2008 |
| 5297 | Synthetic Initialization Vector (SIV) Authenticated Encryption Using the Advanced Encryption Standard (AES)D. Harkins | Informational | October 2008 |
| 5298 | Analysis of Inter-Domain Label Switched Path (LSP) RecoveryT. Takeda, Ed., A. Farrel, Ed., Y. Ikejiri, JP. Vasseur | Informational | August 2008 |
| 5301 | Dynamic Hostname Exchange Mechanism for IS-ISD. McPherson, N. Shen | Proposed Standard | October 2008 |
| 5302 | Domain-Wide Prefix Distribution with Two-Level IS-IST. Li, H. Smit, T. Przygienda | Proposed Standard | October 2008 |
| 5303 | Three-Way Handshake for IS-IS Point-to-Point AdjacenciesD. Katz, R. Saluja, D. Eastlake 3rd | Proposed Standard | October 2008 |
| 5304 | IS-IS Cryptographic AuthenticationT. Li, R. Atkinson | Proposed Standard | October 2008 |
| 5305 | IS-IS Extensions for Traffic EngineeringT. Li, H. Smit | Proposed Standard | October 2008 |
| 5306 | Restart Signaling for IS-ISM. Shand, L. Ginsberg · obsoleted by RFC 8706 | Proposed Standard | October 2008 |
| 5307 | IS-IS Extensions in Support of Generalized Multi-Protocol Label Switching (GMPLS)K. Kompella, Ed., Y. Rekhter, Ed. | Proposed Standard | October 2008 |
| 5308 | Routing IPv6 with IS-ISC. Hopps | Proposed Standard | October 2008 |
| 5309 | Point-to-Point Operation over LAN in Link State Routing ProtocolsN. Shen, Ed., A. Zinin, Ed. | Informational | October 2008 |
| 5310 | IS-IS Generic Cryptographic AuthenticationM. Bhatia, V. Manral, T. Li, R. Atkinson, R. White, M. Fanto | Proposed Standard | February 2009 |
| 5311 | Simplified Extension of Link State PDU (LSP) Space for IS-ISD. McPherson, Ed., L. Ginsberg, S. Previdi, M. Shand | Proposed Standard | February 2009 |
| 5316 | ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic EngineeringM. Chen, R. Zhang, X. Duan · obsoleted by RFC 9346 | Proposed Standard | December 2008 |
| 5317 | Joint Working Team (JWT) Report on MPLS Architectural Considerations for a Transport ProfileS. Bryant, Ed., L. Andersson, Ed. | Informational | February 2009 |
| 5318 | The Session Initiation Protocol (SIP) P-Refused-URI-List Private-Header (P-Header)J. Hautakorpi, G. Camarillo | Informational | December 2008 |
| 5320 | The Subnetwork Encapsulation and Adaptation Layer (SEAL)F. Templin, Ed. | Experimental | February 2010 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5322 | Internet Message FormatP. Resnick, Ed. | Draft Standard | October 2008 |
| 5323 | Web Distributed Authoring and Versioning (WebDAV) SEARCHJ. Reschke, Ed., S. Reddy, J. Davis, A. Babich | Proposed Standard | November 2008 |
| 5324 | MIB for Fibre-Channel Security Protocols (FC-SP)C. DeSanti, F. Maino, K. McCloghrie | Proposed Standard | September 2008 |
| 5325 | Licklider Transmission Protocol - MotivationS. Burleigh, M. Ramadas, S. Farrell | Informational | September 2008 |
| 5326 | Licklider Transmission Protocol - SpecificationM. Ramadas, S. Burleigh, S. Farrell | Experimental | September 2008 |
| 5327 | Licklider Transmission Protocol - Security ExtensionsS. Farrell, M. Ramadas, S. Burleigh | Experimental | September 2008 |
| 5328 | A Uniform Resource Name (URN) Namespace for the Digital Video Broadcasting Project (DVB)A. Adolf, P. MacAvock | Informational | September 2008 |
| 5329 | Traffic Engineering Extensions to OSPF Version 3K. Ishiguro, V. Manral, A. Davey, A. Lindem, Ed. | Proposed Standard | September 2008 |
| 5330 | A Link-Type sub-TLV to Convey the Number of Traffic Engineering Label Switched Paths Signalled with Zero Reserved Bandwidth across a LinkJP. Vasseur, Ed., M. Meyer, K. Kumaki, A. Bonda | Proposed Standard | October 2008 |
| 5331 | MPLS Upstream Label Assignment and Context-Specific Label SpaceR. Aggarwal, Y. Rekhter, E. Rosen | Proposed Standard | August 2008 |
| 5332 | MPLS Multicast EncapsulationsT. Eckert, E. Rosen, Ed., R. Aggarwal, Y. Rekhter | Proposed Standard | August 2008 |
| 5333 | IANA Registration of Enumservices for Internet CalendaringR. Mahy, B. Hoeneisen | Proposed Standard | October 2009 |
| 5334 | Ogg Media TypesI. Goncalves, S. Pfeiffer, C. Montgomery | Proposed Standard | September 2008 |
| 5335 | Internationalized Email HeadersA. Yang, Ed. · obsoleted by RFC 6532 | Experimental | September 2008 |
| 5336 | SMTP Extension for Internationalized Email AddressesJ. Yao, Ed., W. Mao, Ed. · obsoleted by RFC 6531 | Experimental | September 2008 |
| 5337 | Internationalized Delivery Status and Disposition NotificationsC. Newman, A. Melnikov, Ed. · obsoleted by RFC 6533 | Experimental | September 2008 |
| 5338 | Using the Host Identity Protocol with Legacy ApplicationsT. Henderson, P. Nikander, M. Komu | Experimental | September 2008 |
| 5339 | Evaluation of Existing GMPLS Protocols against Multi-Layer and Multi-Region Networks (MLN/MRN)JL. Le Roux, Ed., D. Papadimitriou, Ed. | Informational | September 2008 |
| 5340 | OSPF for IPv6R. Coltun, D. Ferguson, J. Moy, A. Lindem | Proposed Standard | July 2008 |
| 5341 | The Internet Assigned Number Authority (IANA) tel Uniform Resource Identifier (URI) Parameter RegistryC. Jennings, V. Gurbani | Proposed Standard | September 2008 |
| 5342 | IANA Considerations and IETF Protocol Usage for IEEE 802 ParametersD. Eastlake 3rd · obsoleted by RFC 7042 | Best Current Practice | September 2008 |
| 5343 | Simple Network Management Protocol (SNMP) Context EngineID DiscoveryJ. Schoenwaelder | Internet Standard | September 2008 |
| 5344 | Presence and Instant Messaging Peering Use CasesA. Houri, E. Aoki, S. Parameswar | Informational | October 2008 |
| 5345 | Simple Network Management Protocol (SNMP) Traffic Measurements and Trace Exchange FormatsJ. Schoenwaelder | Informational | October 2008 |
| 5346 | Operational Requirements for ENUM-Based Softswitch UseJ. Lim, W. Kim, C. Park, L. Conroy | Informational | October 2008 |