| 5545 | Internet Calendaring and Scheduling Core Object Specification (iCalendar)B. Desruisseaux, Ed. | Proposed Standard | September 2009 |
| 5546 | iCalendar Transport-Independent Interoperability Protocol (iTIP)C. Daboo, Ed. | Proposed Standard | December 2009 |
| 5547 | A Session Description Protocol (SDP) Offer/Answer Mechanism to Enable File TransferM. Garcia-Martin, M. Isomaki, G. Camarillo, S. Loreto, P. Kyzivat | Proposed Standard | May 2009 |
| 5548 | Routing Requirements for Urban Low-Power and Lossy NetworksM. Dohler, Ed., T. Watteyne, Ed., T. Winter, Ed., D. Barthel, Ed. | Informational | May 2009 |
| 5549 | Advertising IPv4 Network Layer Reachability Information with an IPv6 Next HopF. Le Faucheur, E. Rosen · obsoleted by RFC 8950 | Proposed Standard | May 2009 |
| 5550 | The Internet Email to Support Diverse Service Environments (Lemonade) ProfileD. Cridland, Ed., A. Melnikov, Ed., S. Maes, Ed. | Proposed Standard | August 2009 |
| 5551 | Lemonade Notifications ArchitectureR. Gellens, Ed. | Informational | August 2009 |
| 5552 | SIP Interface to VoiceXML Media ServicesD. Burke, M. Scott | Proposed Standard | May 2009 |
| 5553 | Resource Reservation Protocol (RSVP) Extensions for Path Key SupportA. Farrel, Ed., R. Bradford, JP. Vasseur | Proposed Standard | May 2009 |
| 5554 | Clarifications and Extensions to the Generic Security Service Application Program Interface (GSS-API) for the Use of Channel BindingsN. Williams | Proposed Standard | May 2009 |
| 5555 | Mobile IPv6 Support for Dual Stack Hosts and RoutersH. Soliman, Ed. | Proposed Standard | June 2009 |
| 5556 | Transparent Interconnection of Lots of Links (TRILL): Problem and Applicability StatementJ. Touch, R. Perlman | Informational | May 2009 |
| 5557 | Path Computation Element Communication Protocol (PCEP) Requirements and Protocol Extensions in Support of Global Concurrent OptimizationY. Lee, JL. Le Roux, D. King, E. Oki | Proposed Standard | July 2009 |
| 5558 | Virtual Enterprise Traversal (VET)F. Templin, Ed. | Informational | February 2010 |
| 5559 | Pre-Congestion Notification (PCN) ArchitectureP. Eardley, Ed. | Informational | June 2009 |
| 5560 | A One-Way Packet Duplication MetricH. Uijterwaal | Proposed Standard | May 2009 |
| 5561 | LDP CapabilitiesB. Thomas, K. Raza, S. Aggarwal, R. Aggarwal, JL. Le Roux | Proposed Standard | July 2009 |
| 5562 | Adding Explicit Congestion Notification (ECN) Capability to TCP's SYN/ACK PacketsA. Kuzmanovic, A. Mondal, S. Floyd, K. Ramakrishnan | Experimental | June 2009 |
| 5563 | WiMAX Forum / 3GPP2 Proxy Mobile IPv4K. Leung, G. Dommety, P. Yegani, K. Chowdhury | Informational | February 2010 |
| 5564 | Linguistic Guidelines for the Use of the Arabic Language in Internet DomainsA. El-Sherbiny, M. Farah, I. Oueichek, A. Al-Zoman | Informational | February 2010 |
| 5565 | Softwire Mesh FrameworkJ. Wu, Y. Cui, C. Metz, E. Rosen | Proposed Standard | June 2009 |
| 5566 | BGP IPsec Tunnel Encapsulation AttributeL. Berger, R. White, E. Rosen · obsoleted by RFC 9012 | Proposed Standard | June 2009 |
| 5567 | An Architectural Framework for Media Server ControlT. Melanchuk, Ed. | Informational | June 2009 |
| 5568 | Mobile IPv6 Fast HandoversR. Koodli, Ed. | Proposed Standard | July 2009 |
| 5569 | IPv6 Rapid Deployment on IPv4 Infrastructures (6rd)R. Despres | Informational | January 2010 |
| 5570 | Common Architecture Label IPv6 Security Option (CALIPSO)M. StJohns, R. Atkinson, G. Thomas | Informational | July 2009 |
| 5571 | Softwire Hub and Spoke Deployment Framework with Layer Two Tunneling Protocol Version 2 (L2TPv2)B. Storer, C. Pignataro, Ed., M. Dos Santos, B. Stevant, Ed., L. Toutain, J. Tremblay | Proposed Standard | June 2009 |
| 5572 | IPv6 Tunnel Broker with the Tunnel Setup Protocol (TSP)M. Blanchet, F. Parent | Experimental | February 2010 |
| 5573 | Asynchronous Channels for the Blocks Extensible Exchange Protocol (BEEP)M. Thomson | Experimental | June 2009 |
| 5574 | RTP Payload Format for the Speex CodecG. Herlein, J. Valin, A. Heggestad, A. Moizard | Proposed Standard | June 2009 |
| 5575 | Dissemination of Flow Specification RulesP. Marques, N. Sheth, R. Raszuk, B. Greene, J. Mauch, D. McPherson · obsoleted by RFC 8955 | Proposed Standard | August 2009 |
| 5576 | Source-Specific Media Attributes in the Session Description Protocol (SDP)J. Lennox, J. Ott, T. Schierl | Proposed Standard | June 2009 |
| 5577 | RTP Payload Format for ITU-T Recommendation G.722.1P. Luthi, R. Even | Proposed Standard | July 2009 |
| 5578 | PPP over Ethernet (PPPoE) Extensions for Credit Flow and Link MetricsB. Berry, Ed., S. Ratliff, E. Paradise, T. Kaiser, M. Adams | Informational | February 2010 |
| 5579 | Transmission of IPv4 Packets over Intra-Site Automatic Tunnel Addressing Protocol (ISATAP) InterfacesF. Templin, Ed. | Informational | February 2010 |
| 5580 | Carrying Location Objects in RADIUS and DiameterH. Tschofenig, Ed., F. Adrangi, M. Jones, A. Lior, B. Aboba | Proposed Standard | August 2009 |
| 5581 | The Camellia Cipher in OpenPGPD. Shaw · obsoleted by RFC 9580 | Informational | June 2009 |
| 5582 | Location-to-URL Mapping Architecture and FrameworkH. Schulzrinne | Informational | September 2009 |
| 5583 | Signaling Media Decoding Dependency in the Session Description Protocol (SDP)T. Schierl, S. Wenger | Proposed Standard | July 2009 |
| 5584 | RTP Payload Format for the Adaptive TRansform Acoustic Coding (ATRAC) FamilyM. Hatanaka, J. Matsumoto | Proposed Standard | July 2009 |
| 5585 | DomainKeys Identified Mail (DKIM) Service OverviewT. Hansen, D. Crocker, P. Hallam-Baker | Informational | July 2009 |
| 5586 | MPLS Generic Associated ChannelM. Bocci, Ed., M. Vigoureux, Ed., S. Bryant, Ed. | Proposed Standard | June 2009 |
| 5587 | Extended Generic Security Service Mechanism Inquiry APIsN. Williams | Proposed Standard | July 2009 |
| 5588 | Generic Security Service Application Program Interface (GSS-API) Extension for Storing Delegated CredentialsN. Williams | Proposed Standard | July 2009 |
| 5589 | Session Initiation Protocol (SIP) Call Control - TransferR. Sparks, A. Johnston, Ed., D. Petrie | Best Current Practice | June 2009 |
| 5590 | Transport Subsystem for the Simple Network Management Protocol (SNMP)D. Harrington, J. Schoenwaelder | Internet Standard | June 2009 |
| 5591 | Transport Security Model for the Simple Network Management Protocol (SNMP)D. Harrington, W. Hardaker | Internet Standard | June 2009 |
| 5592 | Secure Shell Transport Model for the Simple Network Management Protocol (SNMP)D. Harrington, J. Salowey, W. Hardaker | Proposed Standard | June 2009 |
| 5593 | Internet Message Access Protocol (IMAP) - URL Access Identifier ExtensionN. Cook | Proposed Standard | June 2009 |
| 5594 | Report from the IETF Workshop on Peer-to-Peer (P2P) Infrastructure, May 28, 2008J. Peterson, A. Cooper | Informational | July 2009 |
| 5595 | The Datagram Congestion Control Protocol (DCCP) Service CodesG. Fairhurst | Proposed Standard | September 2009 |
| 5596 | Datagram Congestion Control Protocol (DCCP) Simultaneous-Open Technique to Facilitate NAT/Middlebox TraversalG. Fairhurst | Proposed Standard | September 2009 |
| 5597 | Network Address Translation (NAT) Behavioral Requirements for the Datagram Congestion Control ProtocolR. Denis-Courmont | Best Current Practice | September 2009 |
| 5598 | Internet Mail ArchitectureD. Crocker | Informational | July 2009 |
| 5601 | Pseudowire (PW) Management Information Base (MIB)T. Nadeau, Ed., D. Zelig, Ed. | Proposed Standard | July 2009 |
| 5602 | Pseudowire (PW) over MPLS PSN Management Information Base (MIB)D. Zelig, Ed., T. Nadeau, Ed. | Proposed Standard | July 2009 |
| 5603 | Ethernet Pseudowire (PW) Management Information Base (MIB)D. Zelig, Ed., T. Nadeau, Ed. | Proposed Standard | July 2009 |
| 5604 | Managed Objects for Time Division Multiplexing (TDM) over Packet Switched Networks (PSNs)O. Nicklass | Proposed Standard | July 2009 |
| 5605 | Managed Objects for ATM over Packet Switched Networks (PSNs)O. Nicklass, T. Nadeau | Proposed Standard | July 2009 |
| 5606 | Implications of 'retransmission-allowed' for SIP Location ConveyanceJ. Peterson, T. Hardie, J. Morris | Informational | August 2009 |
| 5607 | Remote Authentication Dial-In User Service (RADIUS) Authorization for Network Access Server (NAS) ManagementD. Nelson, G. Weber | Proposed Standard | July 2009 |
| 5608 | Remote Authentication Dial-In User Service (RADIUS) Usage for Simple Network Management Protocol (SNMP) Transport ModelsK. Narayan, D. Nelson | Proposed Standard | August 2009 |
| 5609 | State Machines for the Protocol for Carrying Authentication for Network Access (PANA)V. Fajardo, Ed., Y. Ohba, R. Marin-Lopez | Informational | August 2009 |
| 5610 | Exporting Type Information for IP Flow Information Export (IPFIX) Information ElementsE. Boschi, B. Trammell, L. Mark, T. Zseby | Proposed Standard | July 2009 |
| 5611 | Layer Two Tunneling Protocol version 3 - Setup of Time-Division Multiplexing (TDM) PseudowiresA. Vainshtein, S. Galtzur | Proposed Standard | August 2009 |
| 5612 | Enterprise Number for Documentation UseP. Eronen, D. Harrington | Informational | August 2009 |
| 5613 | OSPF Link-Local SignalingA. Zinin, A. Roy, L. Nguyen, B. Friedman, D. Yeung | Proposed Standard | August 2009 |
| 5614 | Mobile Ad Hoc Network (MANET) Extension of OSPF Using Connected Dominating Set (CDS) FloodingR. Ogier, P. Spagnolo | Experimental | August 2009 |
| 5615 | H.248/MEGACO Registration ProceduresC. Groves, Y. Lin | Best Current Practice | August 2009 |
| 5616 | Streaming Internet Messaging AttachmentsN. Cook | Informational | August 2009 |
| 5617 | DomainKeys Identified Mail (DKIM) Author Domain Signing Practices (ADSP)E. Allman, J. Fenton, M. Delany, J. Levine | Historic | August 2009 |
| 5618 | Mixed Security Mode for the Two-Way Active Measurement Protocol (TWAMP)A. Morton, K. Hedayat | Proposed Standard | August 2009 |
| 5619 | Softwire Security Analysis and RequirementsS. Yamamoto, C. Williams, H. Yokota, F. Parent | Proposed Standard | August 2009 |
| 5620 | RFC Editor Model (Version 1)O. Kolkman, Ed., IAB · obsoleted by RFC 6548, RFC 6635 | Informational | August 2009 |
| 5621 | Message Body Handling in the Session Initiation Protocol (SIP)G. Camarillo | Proposed Standard | September 2009 |
| 5622 | Profile for Datagram Congestion Control Protocol (DCCP) Congestion ID 4: TCP-Friendly Rate Control for Small Packets (TFRC-SP)S. Floyd, E. Kohler | Experimental | August 2009 |
| 5623 | Framework for PCE-Based Inter-Layer MPLS and GMPLS Traffic EngineeringE. Oki, T. Takeda, JL. Le Roux, A. Farrel | Informational | September 2009 |
| 5624 | Quality of Service Parameters for Usage with DiameterJ. Korhonen, Ed., H. Tschofenig, E. Davies | Proposed Standard | August 2009 |
| 5625 | DNS Proxy Implementation GuidelinesR. Bellis | Best Current Practice | August 2009 |
| 5626 | Managing Client-Initiated Connections in the Session Initiation Protocol (SIP)C. Jennings, Ed., R. Mahy, Ed., F. Audet, Ed. | Proposed Standard | October 2009 |
| 5627 | Obtaining and Using Globally Routable User Agent URIs (GRUUs) in the Session Initiation Protocol (SIP)J. Rosenberg | Proposed Standard | October 2009 |
| 5628 | Registration Event Package Extension for Session Initiation Protocol (SIP) Globally Routable User Agent URIs (GRUUs)P. Kyzivat | Proposed Standard | October 2009 |
| 5629 | A Framework for Application Interaction in the Session Initiation Protocol (SIP)J. Rosenberg | Proposed Standard | October 2009 |
| 5630 | The Use of the SIPS URI Scheme in the Session Initiation Protocol (SIP)F. Audet | Proposed Standard | October 2009 |
| 5631 | Session Initiation Protocol (SIP) Session MobilityR. Shacham, H. Schulzrinne, S. Thakolsri, W. Kellerer | Informational | October 2009 |
| 5632 | Comcast's ISP Experiences in a Proactive Network Provider Participation for P2P (P4P) Technical TrialC. Griffiths, J. Livingood, L. Popkin, R. Woundy, Y. Yang | Informational | September 2009 |
| 5633 | Nominating Committee Process: Earlier Announcement of Open Positions and Solicitation of VolunteersS. Dawkins, Ed. · obsoleted by RFC 7437 | Best Current Practice | August 2009 |
| 5634 | Quick-Start for the Datagram Congestion Control Protocol (DCCP)G. Fairhurst, A. Sathiaseelan | Experimental | August 2009 |
| 5635 | Remote Triggered Black Hole Filtering with Unicast Reverse Path Forwarding (uRPF)W. Kumari, D. McPherson | Informational | August 2009 |
| 5636 | Traceable Anonymous CertificateS. Park, H. Park, Y. Won, J. Lee, S. Kent | Experimental | August 2009 |
| 5637 | Authentication, Authorization, and Accounting (AAA) Goals for Mobile IPv6G. Giaretta, I. Guardini, E. Demaria, J. Bournelle, R. Lopez | Informational | September 2009 |
| 5638 | Simple SIP Usage Scenario for Applications in the EndpointsH. Sinnreich, Ed., A. Johnston, E. Shim, K. Singh | Informational | September 2009 |
| 5639 | Elliptic Curve Cryptography (ECC) Brainpool Standard Curves and Curve GenerationM. Lochter, J. Merkle | Informational | March 2010 |
| 5640 | Load-Balancing for Mesh SoftwiresC. Filsfils, P. Mohapatra, C. Pignataro | Proposed Standard | August 2009 |
| 5641 | Layer 2 Tunneling Protocol Version 3 (L2TPv3) Extended Circuit Status ValuesN. McGill, C. Pignataro | Proposed Standard | August 2009 |
| 5642 | Dynamic Hostname Exchange Mechanism for OSPFS. Venkata, S. Harwani, C. Pignataro, D. McPherson | Proposed Standard | August 2009 |
| 5643 | Management Information Base for OSPFv3D. Joyal, Ed., V. Manral, Ed. | Proposed Standard | August 2009 |