| 5446 | Service Selection for Mobile IPv4J. Korhonen, U. Nilsson | Informational | February 2009 |
| 5447 | Diameter Mobile IPv6: Support for Network Access Server to Diameter Server InteractionJ. Korhonen, Ed., J. Bournelle, H. Tschofenig, C. Perkins, K. Chowdhury | Proposed Standard | February 2009 |
| 5448 | Improved Extensible Authentication Protocol Method for 3rd Generation Authentication and Key Agreement (EAP-AKA')J. Arkko, V. Lehtovirta, P. Eronen | Informational | May 2009 |
| 5449 | OSPF Multipoint Relay (MPR) Extension for Ad Hoc NetworksE. Baccelli, P. Jacquet, D. Nguyen, T. Clausen | Experimental | February 2009 |
| 5450 | Transmission Time Offsets in RTP StreamsD. Singer, H. Desineni | Proposed Standard | March 2009 |
| 5451 | Message Header Field for Indicating Message Authentication StatusM. Kucherawy · obsoleted by RFC 7001 | Proposed Standard | April 2009 |
| 5452 | Measures for Making DNS More Resilient against Forged AnswersA. Hubert, R. van Mook | Proposed Standard | January 2009 |
| 5453 | Reserved IPv6 Interface IdentifiersS. Krishnan | Proposed Standard | February 2009 |
| 5454 | Dual-Stack Mobile IPv4G. Tsirtsis, V. Park, H. Soliman | Proposed Standard | March 2009 |
| 5455 | Diffserv-Aware Class-Type Object for the Path Computation Element Communication ProtocolS. Sivabalan, Ed., J. Parker, S. Boutros, K. Kumaki | Proposed Standard | March 2009 |
| 5456 | IAX: Inter-Asterisk eXchange Version 2M. Spencer, B. Capouch, E. Guy, Ed., F. Miller, K. Shumard | Informational | February 2010 |
| 5457 | IANA Considerations for IAX: Inter-Asterisk eXchange Version 2E. Guy, Ed. | Informational | February 2010 |
| 5458 | Security Requirements for the Unidirectional Lightweight Encapsulation (ULE) ProtocolH. Cruickshank, P. Pillai, M. Noisternig, S. Iyengar | Informational | March 2009 |
| 5459 | G.729.1 RTP Payload Format Update: Discontinuous Transmission (DTX) SupportA. Sollaud | Proposed Standard | January 2009 |
| 5460 | DHCPv6 Bulk LeasequeryM. Stapp | Proposed Standard | February 2009 |
| 5461 | TCP's Reaction to Soft ErrorsF. Gont | Informational | February 2009 |
| 5462 | Multiprotocol Label Switching (MPLS) Label Stack Entry: "EXP" Field Renamed to "Traffic Class" FieldL. Andersson, R. Asati | Proposed Standard | February 2009 |
| 5463 | Sieve Email Filtering: Ihave ExtensionN. Freed | Proposed Standard | March 2009 |
| 5464 | The IMAP METADATA ExtensionC. Daboo | Proposed Standard | February 2009 |
| 5465 | The IMAP NOTIFY ExtensionA. Gulbrandsen, C. King, A. Melnikov | Proposed Standard | February 2009 |
| 5466 | IMAP4 Extension for Named Searches (Filters)A. Melnikov, C. King | Proposed Standard | February 2009 |
| 5467 | GMPLS Asymmetric Bandwidth Bidirectional Label Switched Paths (LSPs)L. Berger, A. Takacs, D. Caviglia, D. Fedyk, J. Meuric · obsoleted by RFC 6387 | Experimental | March 2009 |
| 5468 | Performance Analysis of Inter-Domain Path Computation MethodologiesS. Dasgupta, J. de Oliveira, JP. Vasseur | Informational | April 2009 |
| 5469 | DES and IDEA Cipher Suites for Transport Layer Security (TLS)P. Eronen, Ed. · obsoleted by RFC 8996 | Historic | February 2009 |
| 5470 | Architecture for IP Flow Information ExportG. Sadasivan, N. Brownlee, B. Claise, J. Quittek | Informational | March 2009 |
| 5471 | Guidelines for IP Flow Information Export (IPFIX) TestingC. Schmoll, P. Aitken, B. Claise | Informational | March 2009 |
| 5472 | IP Flow Information Export (IPFIX) ApplicabilityT. Zseby, E. Boschi, N. Brownlee, B. Claise | Informational | March 2009 |
| 5473 | Reducing Redundancy in IP Flow Information Export (IPFIX) and Packet Sampling (PSAMP) ReportsE. Boschi, L. Mark, B. Claise | Informational | March 2009 |
| 5474 | A Framework for Packet Selection and ReportingN. Duffield, Ed., D. Chiou, B. Claise, A. Greenberg, M. Grossglauser, J. Rexford | Informational | March 2009 |
| 5475 | Sampling and Filtering Techniques for IP Packet SelectionT. Zseby, M. Molina, N. Duffield, S. Niccolini, F. Raspall | Proposed Standard | March 2009 |
| 5476 | Packet Sampling (PSAMP) Protocol SpecificationsB. Claise, Ed., A. Johnson, J. Quittek | Proposed Standard | March 2009 |
| 5477 | Information Model for Packet Sampling ExportsT. Dietz, B. Claise, P. Aitken, F. Dressler, G. Carle | Proposed Standard | March 2009 |
| 5478 | IANA Registration of New Session Initiation Protocol (SIP) Resource-Priority NamespacesJ. Polk | Proposed Standard | March 2009 |
| 5479 | Requirements and Analysis of Media Security Management ProtocolsD. Wing, Ed., S. Fries, H. Tschofenig, F. Audet | Informational | April 2009 |
| 5480 | Elliptic Curve Cryptography Subject Public Key InformationS. Turner, D. Brown, K. Yiu, R. Housley, T. Polk | Proposed Standard | March 2009 |
| 5481 | Packet Delay Variation Applicability StatementA. Morton, B. Claise | Informational | March 2009 |
| 5482 | TCP User Timeout OptionL. Eggert, F. Gont | Proposed Standard | March 2009 |
| 5483 | ENUM Implementation Issues and ExperiencesL. Conroy, K. Fujiwara | Informational | March 2009 |
| 5484 | Associating Time-Codes with RTP StreamsD. Singer | Proposed Standard | March 2009 |
| 5485 | Digital Signatures on Internet-Draft DocumentsR. Housley | Informational | March 2009 |
| 5486 | Session Peering for Multimedia Interconnect (SPEERMINT) TerminologyD. Malas, Ed., D. Meyer, Ed. | Informational | March 2009 |
| 5487 | Pre-Shared Key Cipher Suites for TLS with SHA-256/384 and AES Galois Counter ModeM. Badra | Proposed Standard | March 2009 |
| 5488 | Network Mobility (NEMO) Management Information BaseS. Gundavelli, G. Keeni, K. Koide, K. Nagami | Proposed Standard | April 2009 |
| 5489 | ECDHE_PSK Cipher Suites for Transport Layer Security (TLS)M. Badra, I. Hajjeh | Informational | March 2009 |
| 5490 | The Sieve Mail-Filtering Language -- Extensions for Checking Mailbox Status and Accessing Mailbox MetadataA. Melnikov | Proposed Standard | March 2009 |
| 5491 | GEOPRIV Presence Information Data Format Location Object (PIDF-LO) Usage Clarification, Considerations, and RecommendationsJ. Winterbottom, M. Thomson, H. Tschofenig | Proposed Standard | March 2009 |
| 5492 | Capabilities Advertisement with BGP-4J. Scudder, R. Chandra | Draft Standard | February 2009 |
| 5493 | Requirements for the Conversion between Permanent Connections and Switched Connections in a Generalized Multiprotocol Label Switching (GMPLS) NetworkD. Caviglia, D. Bramanti, D. Li, D. McDysan | Informational | April 2009 |
| 5494 | IANA Allocation Guidelines for the Address Resolution Protocol (ARP)J. Arkko, C. Pignataro | Proposed Standard | April 2009 |
| 5495 | Description of the Resource Reservation Protocol - Traffic-Engineered (RSVP-TE) Graceful Restart ProceduresD. Li, J. Gao, A. Satyanarayana, S. Bardalai | Informational | March 2009 |
| 5496 | The Reverse Path Forwarding (RPF) Vector TLVIJ. Wijnands, A. Boers, E. Rosen | Proposed Standard | March 2009 |
| 5497 | Representing Multi-Value Time in Mobile Ad Hoc Networks (MANETs)T. Clausen, C. Dearlove | Proposed Standard | March 2009 |
| 5498 | IANA Allocations for Mobile Ad Hoc Network (MANET) ProtocolsI. Chakeres | Proposed Standard | March 2009 |
| 5501 | Requirements for Multicast Support in Virtual Private LAN ServicesY. Kamite, Ed., Y. Wada, Y. Serbest, T. Morin, L. Fang | Informational | March 2009 |
| 5502 | The SIP P-Served-User Private-Header (P-Header) for the 3GPP IP Multimedia (IM) Core Network (CN) SubsystemJ. van Elburg | Informational | April 2009 |
| 5503 | Private Session Initiation Protocol (SIP) Proxy-to-Proxy Extensions for Supporting the PacketCable Distributed Call Signaling ArchitectureF. Andreasen, B. McKibben, B. Marshall | Informational | March 2009 |
| 5504 | Downgrading Mechanism for Email Address InternationalizationK. Fujiwara, Ed., Y. Yoneya, Ed. · obsoleted by RFC 6530 | Experimental | March 2009 |
| 5505 | Principles of Internet Host ConfigurationB. Aboba, D. Thaler, L. Andersson, S. Cheshire | Informational | May 2009 |
| 5506 | Support for Reduced-Size Real-Time Transport Control Protocol (RTCP): Opportunities and ConsequencesI. Johansson, M. Westerlund | Proposed Standard | April 2009 |
| 5507 | Design Choices When Expanding the DNSIAB, P. Faltstrom, Ed., R. Austein, Ed., P. Koch, Ed. | Informational | April 2009 |
| 5508 | NAT Behavioral Requirements for ICMPP. Srisuresh, B. Ford, S. Sivakumar, S. Guha | Best Current Practice | April 2009 |
| 5509 | Internet Assigned Numbers Authority (IANA) Registration of Instant Messaging and Presence DNS SRV RRs for the Session Initiation Protocol (SIP)S. Loreto | Proposed Standard | April 2009 |
| 5510 | Reed-Solomon Forward Error Correction (FEC) SchemesJ. Lacan, V. Roca, J. Peltotalo, S. Peltotalo | Proposed Standard | April 2009 |
| 5511 | Routing Backus-Naur Form (RBNF): A Syntax Used to Form Encoding Rules in Various Routing Protocol SpecificationsA. Farrel | Proposed Standard | April 2009 |
| 5512 | The BGP Encapsulation Subsequent Address Family Identifier (SAFI) and the BGP Tunnel Encapsulation AttributeP. Mohapatra, E. Rosen · obsoleted by RFC 9012 | Proposed Standard | April 2009 |
| 5513 | IANA Considerations for Three Letter AcronymsA. Farrel | Informational | 1 April 2009 |
| 5514 | IPv6 over Social NetworksE. Vyncke | Experimental | 1 April 2009 |
| 5515 | Layer 2 Tunneling Protocol (L2TP) Access Line Information Attribute Value Pair (AVP) ExtensionsV. Mammoliti, C. Pignataro, P. Arberg, J. Gibbons, P. Howard | Informational | May 2009 |
| 5516 | Diameter Command Code Registration for the Third Generation Partnership Project (3GPP) Evolved Packet System (EPS)M. Jones, L. Morand | Informational | April 2009 |
| 5517 | Cisco Systems' Private VLANs: Scalable Security in a Multi-Client EnvironmentS. HomChaudhuri, M. Foschiano | Informational | February 2010 |
| 5518 | Vouch By ReferenceP. Hoffman, J. Levine, A. Hathcock | Proposed Standard | April 2009 |
| 5519 | Multicast Group Membership Discovery MIBJ. Chesterfield, B. Haberman, Ed. | Proposed Standard | April 2009 |
| 5520 | Preserving Topology Confidentiality in Inter-Domain Path Computation Using a Path-Key-Based MechanismR. Bradford, Ed., JP. Vasseur, A. Farrel | Proposed Standard | April 2009 |
| 5521 | Extensions to the Path Computation Element Communication Protocol (PCEP) for Route ExclusionsE. Oki, T. Takeda, A. Farrel | Proposed Standard | April 2009 |
| 5522 | Network Mobility Route Optimization Requirements for Operational Use in Aeronautics and Space Exploration Mobile NetworksW. Eddy, W. Ivancic, T. Davis | Informational | October 2009 |
| 5523 | OSPFv3-Based Layer 1 VPN Auto-DiscoveryL. Berger | Experimental | April 2009 |
| 5524 | Extended URLFETCH for Binary and Converted PartsD. Cridland | Proposed Standard | May 2009 |
| 5525 | Reliable Server Pooling MIB Module DefinitionT. Dreibholz, J. Mulik | Experimental | April 2009 |
| 5526 | The E.164 to Uniform Resource Identifiers (URI) Dynamic Delegation Discovery System (DDDS) Application for Infrastructure ENUMJ. Livingood, P. Pfautz, R. Stastny | Informational | April 2009 |
| 5527 | Combined User and Infrastructure ENUM in the e164.arpa TreeM. Haberler, O. Lendl, R. Stastny | Informational | May 2009 |
| 5528 | Camellia Counter Mode and Camellia Counter with CBC-MAC Mode AlgorithmsA. Kato, M. Kanda, S. Kanno | Informational | April 2009 |
| 5529 | Modes of Operation for Camellia for Use with IPsecA. Kato, M. Kanda, S. Kanno | Proposed Standard | April 2009 |
| 5530 | IMAP Response CodesA. Gulbrandsen | Proposed Standard | May 2009 |
| 5531 | RPC: Remote Procedure Call Protocol Specification Version 2R. Thurlow | Draft Standard | May 2009 |
| 5532 | Network File System (NFS) Remote Direct Memory Access (RDMA) Problem StatementT. Talpey, C. Juszczak | Informational | May 2009 |
| 5533 | Shim6: Level 3 Multihoming Shim Protocol for IPv6E. Nordmark, M. Bagnulo | Proposed Standard | June 2009 |
| 5534 | Failure Detection and Locator Pair Exploration Protocol for IPv6 MultihomingJ. Arkko, I. van Beijnum | Proposed Standard | June 2009 |
| 5535 | Hash-Based Addresses (HBA)M. Bagnulo | Proposed Standard | June 2009 |
| 5536 | Netnews Article FormatK. Murchison, Ed., C. Lindsey, D. Kohn | Proposed Standard | November 2009 |
| 5537 | Netnews Architecture and ProtocolsR. Allbery, Ed., C. Lindsey | Proposed Standard | November 2009 |
| 5538 | The 'news' and 'nntp' URI SchemesF. Ellermann | Proposed Standard | April 2010 |
| 5539 | NETCONF over Transport Layer Security (TLS)M. Badra · obsoleted by RFC 7589 | Proposed Standard | May 2009 |
| 5540 | 40 Years of RFCsRFC Editor | Informational | April 2009 |
| 5541 | Encoding of Objective Functions in the Path Computation Element Communication Protocol (PCEP)JL. Le Roux, JP. Vasseur, Y. Lee | Proposed Standard | June 2009 |
| 5542 | Definitions of Textual Conventions for Pseudowire (PW) ManagementT. Nadeau, Ed., D. Zelig, Ed., O. Nicklass, Ed. | Proposed Standard | May 2009 |
| 5543 | BGP Traffic Engineering AttributeH. Ould-Brahim, D. Fedyk, Y. Rekhter | Proposed Standard | May 2009 |
| 5544 | Syntax for Binding Documents with Time-StampsA. Santoni | Informational | February 2010 |