| 768 | User Datagram ProtocolJ. Postel | Internet Standard | August 1980 |
| 791 | Internet ProtocolJ. Postel | Internet Standard | September 1981 |
| 792 | Internet Control Message ProtocolJ. Postel | Internet Standard | September 1981 |
| 793 | Transmission Control ProtocolJ. Postel · obsoleted by RFC 9293 | Internet Standard | September 1981 |
| 826 | An Ethernet Address Resolution Protocol: Or Converting Network Protocol Addresses to 48.bit Ethernet Address for Transmission on Ethernet HardwareD. Plummer | Internet Standard | November 1982 |
| 894 | A Standard for the Transmission of IP Datagrams over Ethernet NetworksC. Hornig | Internet Standard | April 1984 |
| 1006 | ISO Transport Service on top of the TCP Version: 3M.T. Rose, D.E. Cass | Internet Standard | May 1987 |
| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 1058 | Routing Information ProtocolC.L. Hedrick | Historic | June 1988 |
| 1112 | Host extensions for IP multicastingS.E. Deering | Internet Standard | August 1989 |
| 1122 | Requirements for Internet Hosts - Communication LayersR. Braden, Ed. | Internet Standard | October 1989 |
| 1123 | Requirements for Internet Hosts - Application and SupportR. Braden, Ed. | Internet Standard | October 1989 |
| 1195 | Use of OSI IS-IS for routing in TCP/IP and dual environmentsR. Callon | Proposed Standard | December 1990 |
| 1332 | The PPP Internet Protocol Control Protocol (IPCP)G. McGregor | Proposed Standard | May 1992 |
| 1661 | The Point-to-Point Protocol (PPP)W. Simpson, Ed. | Internet Standard | July 1994 |
| 1812 | Requirements for IP Version 4 RoutersF. Baker, Ed. | Proposed Standard | June 1995 |
| 1918 | Address Allocation for Private InternetsY. Rekhter, B. Moskowitz, D. Karrenberg, G. J. de Groot, E. Lear | Best Current Practice | February 1996 |
| 1964 | The Kerberos Version 5 GSS-API MechanismJ. Linn | Proposed Standard | June 1996 |
| 2080 | RIPng for IPv6G. Malkin, R. Minnear | Proposed Standard | January 1997 |
| 2126 | ISO Transport Service on top of TCP (ITOT)Y. Pouffary, A. Young | Proposed Standard | March 1997 |
| 2131 | Dynamic Host Configuration ProtocolR. Droms | Draft Standard | March 1997 |
| 2136 | Dynamic Updates in the Domain Name System (DNS UPDATE)P. Vixie, Ed., S. Thomson, Y. Rekhter, J. Bound | Proposed Standard | April 1997 |
| 2328 | OSPF Version 2J. Moy | Internet Standard | April 1998 |
| 2357 | IETF Criteria for Evaluating Reliable Multicast Transport and Application ProtocolsA. Mankin, A. Romanow, S. Bradner, V. Paxson | Informational | June 1998 |
| 2453 | RIP Version 2G. Malkin | Internet Standard | November 1998 |
| 2460 | Internet Protocol, Version 6 (IPv6) SpecificationS. Deering, R. Hinden · obsoleted by RFC 8200 | Draft Standard | December 1998 |
| 2464 | Transmission of IPv6 Packets over Ethernet NetworksM. Crawford | Proposed Standard | December 1998 |
| 2474 | Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 HeadersK. Nichols, S. Blake, F. Baker, D. Black | Proposed Standard | December 1998 |
| 2475 | An Architecture for Differentiated ServicesS. Blake, D. Black, M. Carlson, E. Davies, Z. Wang, W. Weiss | Informational | December 1998 |
| 2516 | A Method for Transmitting PPP Over Ethernet (PPPoE)L. Mamakos, K. Lidl, J. Evarts, D. Carrel, D. Simone, R. Wheeler | Informational | February 1999 |
| 2545 | Use of BGP-4 Multiprotocol Extensions for IPv6 Inter-Domain RoutingP. Marques, F. Dupont | Proposed Standard | March 1999 |
| 2560 | X.509 Internet Public Key Infrastructure Online Certificate Status Protocol - OCSPM. Myers, R. Ankney, A. Malpani, S. Galperin, C. Adams · obsoleted by RFC 6960 | Proposed Standard | June 1999 |
| 2588 | IP Multicast and FirewallsR. Finlayson | Informational | May 1999 |
| 2608 | Service Location Protocol, Version 2E. Guttman, C. Perkins, J. Veizades, M. Day | Proposed Standard | June 1999 |
| 2615 | PPP over SONET/SDHA. Malis, W. Simpson | Proposed Standard | June 1999 |
| 2616 | Hypertext Transfer Protocol -- HTTP/1.1R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee · obsoleted by RFC 7230, RFC 7231, RFC 7232, RFC 7233, RFC 7234, RFC 7235 | Draft Standard | June 1999 |
| 2647 | Benchmarking Terminology for Firewall PerformanceD. Newman | Informational | August 1999 |
| 2663 | IP Network Address Translator (NAT) Terminology and ConsiderationsP. Srisuresh, M. Holdrege | Informational | August 1999 |
| 2710 | Multicast Listener Discovery (MLD) for IPv6S. Deering, W. Fenner, B. Haberman | Proposed Standard | October 1999 |
| 2743 | Generic Security Service Application Program Interface Version 2, Update 1J. Linn | Proposed Standard | January 2000 |
| 2784 | Generic Routing Encapsulation (GRE)D. Farinacci, T. Li, S. Hanks, D. Meyer, P. Traina | Proposed Standard | March 2000 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 2979 | Behavior of and Requirements for Internet FirewallsN. Freed | Informational | October 2000 |
| 2993 | Architectural Implications of NATT. Hain | Informational | November 2000 |
| 3007 | Secure Domain Name System (DNS) Dynamic UpdateB. Wellington | Proposed Standard | November 2000 |
| 3022 | Traditional IP Network Address Translator (Traditional NAT)P. Srisuresh, K. Egevang | Informational | January 2001 |
| 3027 | Protocol Complications with the IP Network Address TranslatorM. Holdrege, P. Srisuresh | Informational | January 2001 |
| 3031 | Multiprotocol Label Switching ArchitectureE. Rosen, A. Viswanathan, R. Callon | Proposed Standard | January 2001 |
| 3032 | MPLS Label Stack EncodingE. Rosen, D. Tappan, G. Fedorkow, Y. Rekhter, D. Farinacci, T. Li, A. Conta | Proposed Standard | January 2001 |
| 3168 | The Addition of Explicit Congestion Notification (ECN) to IPK. Ramakrishnan, S. Floyd, D. Black | Proposed Standard | September 2001 |
| 3235 | Network Address Translator (NAT)-Friendly Application Design GuidelinesD. Senie | Informational | January 2002 |
| 3261 | SIP: Session Initiation ProtocolJ. Rosenberg, H. Schulzrinne, G. Camarillo, A. Johnston, J. Peterson, R. Sparks, M. Handley, E. Schooler | Proposed Standard | July 2002 |
| 3265 | Session Initiation Protocol (SIP)-Specific Event NotificationA. B. Roach · obsoleted by RFC 6665 | Proposed Standard | July 2002 |
| 3275 | (Extensible Markup Language) XML-Signature Syntax and ProcessingD. Eastlake 3rd, J. Reagle, D. Solo | Draft Standard | March 2002 |
| 3315 | Dynamic Host Configuration Protocol for IPv6 (DHCPv6)R. Droms, Ed., J. Bound, B. Volz, T. Lemon, C. Perkins, M. Carney · obsoleted by RFC 8415 | Proposed Standard | July 2003 |
| 3376 | Internet Group Management Protocol, Version 3B. Cain, S. Deering, I. Kouvelas, B. Fenner, A. Thyagarajan · obsoleted by RFC 9776 | Proposed Standard | October 2002 |
| 3411 | An Architecture for Describing Simple Network Management Protocol (SNMP) Management FrameworksD. Harrington, R. Presuhn, B. Wijnen | Internet Standard | December 2002 |
| 3412 | Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)J. Case, D. Harrington, R. Presuhn, B. Wijnen | Internet Standard | December 2002 |
| 3413 | Simple Network Management Protocol (SNMP) ApplicationsD. Levi, P. Meyer, B. Stewart | Internet Standard | December 2002 |
| 3414 | User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)U. Blumenthal, B. Wijnen | Internet Standard | December 2002 |
| 3415 | View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)B. Wijnen, R. Presuhn, K. McCloghrie | Internet Standard | December 2002 |
| 3416 | Version 2 of the Protocol Operations for the Simple Network Management Protocol (SNMP)R. Presuhn, Ed. | Internet Standard | December 2002 |
| 3417 | Transport Mappings for the Simple Network Management Protocol (SNMP)R. Presuhn, Ed. | Internet Standard | December 2002 |
| 3418 | Management Information Base (MIB) for the Simple Network Management Protocol (SNMP)R. Presuhn, Ed. | Internet Standard | December 2002 |
| 3424 | IAB Considerations for UNilateral Self-Address Fixing (UNSAF) Across Network Address TranslationL. Daigle, Ed., IAB | Informational | November 2002 |
| 3436 | Transport Layer Security over Stream Control Transmission ProtocolA. Jungmaier, E. Rescorla, M. Tuexen | Proposed Standard | December 2002 |
| 3453 | The Use of Forward Error Correction (FEC) in Reliable MulticastM. Luby, L. Vicisano, J. Gemmell, L. Rizzo, M. Handley, J. Crowcroft | Informational | December 2002 |
| 3511 | Benchmarking Methodology for Firewall PerformanceB. Hickman, D. Newman, S. Tadjudin, T. Martin · obsoleted by RFC 9411 | Informational | April 2003 |
| 3550 | RTP: A Transport Protocol for Real-Time ApplicationsH. Schulzrinne, S. Casner, R. Frederick, V. Jacobson | Internet Standard | July 2003 |
| 3552 | Guidelines for Writing RFC Text on Security ConsiderationsE. Rescorla, B. Korver | Best Current Practice | July 2003 |
| 3561 | Ad hoc On-Demand Distance Vector (AODV) RoutingC. Perkins, E. Belding-Royer, S. Das | Experimental | July 2003 |
| 3569 | An Overview of Source-Specific Multicast (SSM)S. Bhattacharyya, Ed. | Informational | July 2003 |
| 3588 | Diameter Base ProtocolP. Calhoun, J. Loughney, E. Guttman, G. Zorn, J. Arkko · obsoleted by RFC 6733 | Proposed Standard | September 2003 |
| 3590 | Source Address Selection for the Multicast Listener Discovery (MLD) ProtocolB. Haberman | Proposed Standard | September 2003 |
| 3626 | Optimized Link State Routing Protocol (OLSR)T. Clausen, Ed., P. Jacquet, Ed. | Experimental | October 2003 |
| 3629 | UTF-8, a transformation format of ISO 10646F. Yergeau | Internet Standard | November 2003 |
| 3715 | IPsec-Network Address Translation (NAT) Compatibility RequirementsB. Aboba, W. Dixon | Informational | March 2004 |
| 3810 | Multicast Listener Discovery Version 2 (MLDv2) for IPv6R. Vida, Ed., L. Costa, Ed. · obsoleted by RFC 9777 | Proposed Standard | June 2004 |
| 3828 | The Lightweight User Datagram Protocol (UDP-Lite)L-A. Larzon, M. Degermark, S. Pink, L-E. Jonsson, Ed., G. Fairhurst, Ed. | Proposed Standard | July 2004 |
| 3853 | S/MIME Advanced Encryption Standard (AES) Requirement for the Session Initiation Protocol (SIP)J. Peterson | Proposed Standard | July 2004 |
| 3923 | End-to-End Signing and Object Encryption for the Extensible Messaging and Presence Protocol (XMPP)P. Saint-Andre | Proposed Standard | October 2004 |
| 3971 | SEcure Neighbor Discovery (SEND)J. Arkko, Ed., J. Kempf, B. Zill, P. Nikander | Proposed Standard | March 2005 |
| 3973 | Protocol Independent Multicast - Dense Mode (PIM-DM): Protocol Specification (Revised)A. Adams, J. Nicholas, W. Siadak | Experimental | January 2005 |
| 4017 | Extensible Authentication Protocol (EAP) Method Requirements for Wireless LANsD. Stanley, J. Walker, B. Aboba | Informational | March 2005 |
| 4033 | DNS Security Introduction and RequirementsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4034 | Resource Records for the DNS Security ExtensionsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4035 | Protocol Modifications for the DNS Security ExtensionsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4108 | Using Cryptographic Message Syntax (CMS) to Protect Firmware PackagesR. Housley | Proposed Standard | August 2005 |
| 4120 | The Kerberos Network Authentication Service (V5)C. Neuman, T. Yu, S. Hartman, K. Raeburn | Proposed Standard | July 2005 |
| 4121 | The Kerberos Version 5 Generic Security Service Application Program Interface (GSS-API) Mechanism: Version 2L. Zhu, K. Jaganathan, S. Hartman | Proposed Standard | July 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 |
| 4213 | Basic Transition Mechanisms for IPv6 Hosts and RoutersE. Nordmark, R. Gilligan | Proposed Standard | October 2005 |
| 4253 | The Secure Shell (SSH) Transport Layer ProtocolT. Ylonen, C. Lonvick, Ed. | Proposed Standard | January 2006 |
| 4271 | A Border Gateway Protocol 4 (BGP-4)Y. Rekhter, Ed., T. Li, Ed., S. Hares, Ed. | Draft Standard | January 2006 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4294 | IPv6 Node RequirementsJ. Loughney, Ed. · obsoleted by RFC 6434 | Informational | April 2006 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4302 | IP Authentication HeaderS. Kent | Proposed Standard | December 2005 |
| 4303 | IP Encapsulating Security Payload (ESP)S. Kent | Proposed Standard | December 2005 |
| 4307 | Cryptographic Algorithms for Use in the Internet Key Exchange Version 2 (IKEv2)J. Schiller · obsoleted by RFC 8247 | Proposed Standard | December 2005 |
| 4320 | Actions Addressing Identified Issues with the Session Initiation Protocol's (SIP) Non-INVITE TransactionR. Sparks | Proposed Standard | January 2006 |
| 4340 | Datagram Congestion Control Protocol (DCCP)E. Kohler, M. Handley, S. Floyd | Proposed Standard | March 2006 |
| 4347 | Datagram Transport Layer SecurityE. Rescorla, N. Modadugu · obsoleted by RFC 6347 | Historic | April 2006 |
| 4364 | BGP/MPLS IP Virtual Private Networks (VPNs)E. Rosen, Y. Rekhter | Proposed Standard | February 2006 |
| 4410 | Selectively Reliable Multicast Protocol (SRMP)M. Pullen, F. Zhao, D. Cohen | Experimental | February 2006 |
| 4422 | Simple Authentication and Security Layer (SASL)A. Melnikov, Ed., K. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4443 | Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) SpecificationA. Conta, S. Deering, M. Gupta, Ed. | Internet Standard | March 2006 |
| 4487 | Mobile IPv6 and Firewalls: Problem StatementF. Le, S. Faccin, B. Patil, H. Tschofenig | Informational | May 2006 |
| 4492 | Elliptic Curve Cryptography (ECC) Cipher Suites for Transport Layer Security (TLS)S. Blake-Wilson, N. Bolyard, V. Gupta, C. Hawk, B. Moeller · obsoleted by RFC 8422 | Informational | May 2006 |
| 4556 | Public Key Cryptography for Initial Authentication in Kerberos (PKINIT)L. Zhu, B. Tung | Proposed Standard | June 2006 |
| 4566 | SDP: Session Description ProtocolM. Handley, V. Jacobson, C. Perkins · obsoleted by RFC 8866 | Proposed Standard | July 2006 |
| 4594 | Configuration Guidelines for DiffServ Service ClassesJ. Babiarz, K. Chan, F. Baker | Informational | August 2006 |
| 4601 | Protocol Independent Multicast - Sparse Mode (PIM-SM): Protocol Specification (Revised)B. Fenner, M. Handley, H. Holbrook, I. Kouvelas · obsoleted by RFC 7761 | Proposed Standard | August 2006 |
| 4604 | Using Internet Group Management Protocol Version 3 (IGMPv3) and Multicast Listener Discovery Protocol Version 2 (MLDv2) for Source-Specific MulticastH. Holbrook, B. Cain, B. Haberman | Proposed Standard | August 2006 |
| 4607 | Source-Specific Multicast for IPH. Holbrook, B. Cain | Proposed Standard | August 2006 |
| 4608 | Source-Specific Protocol Independent Multicast in 232/8D. Meyer, R. Rockell, G. Shepherd | Best Current Practice | August 2006 |
| 4614 | A Roadmap for Transmission Control Protocol (TCP) Specification DocumentsM. Duke, R. Braden, W. Eddy, E. Blanton · obsoleted by RFC 7414 | Informational | September 2006 |
| 4741 | NETCONF Configuration ProtocolR. Enns, Ed. · obsoleted by RFC 6241 | Proposed Standard | December 2006 |
| 4742 | Using the NETCONF Configuration Protocol over Secure SHell (SSH)M. Wasserman, T. Goddard · obsoleted by RFC 6242 | Proposed Standard | December 2006 |
| 4743 | Using NETCONF over the Simple Object Access Protocol (SOAP)T. Goddard | Historic | December 2006 |
| 4744 | Using the NETCONF Protocol over the Blocks Extensible Exchange Protocol (BEEP)E. Lear, K. Crozier | Historic | December 2006 |
| 4760 | Multiprotocol Extensions for BGP-4T. Bates, R. Chandra, D. Katz, Y. Rekhter | Draft Standard | January 2007 |
| 4787 | Network Address Translation (NAT) Behavioral Requirements for Unicast UDPF. Audet, Ed., C. Jennings | Best Current Practice | January 2007 |
| 4835 | Cryptographic Algorithm Implementation Requirements for Encapsulating Security Payload (ESP) and Authentication Header (AH)V. Manral · obsoleted by RFC 7321 | Proposed Standard | April 2007 |
| 4854 | A Uniform Resource Name (URN) Namespace for Extensions to the Extensible Messaging and Presence Protocol (XMPP)P. Saint-Andre | Informational | April 2007 |
| 4861 | Neighbor Discovery for IP version 6 (IPv6)T. Narten, E. Nordmark, W. Simpson, H. Soliman | Draft Standard | September 2007 |
| 4862 | IPv6 Stateless Address AutoconfigurationS. Thomson, T. Narten, T. Jinmei | Draft Standard | September 2007 |
| 4916 | Connected Identity in the Session Initiation Protocol (SIP)J. Elwell | Proposed Standard | June 2007 |
| 4919 | IPv6 over Low-Power Wireless Personal Area Networks (6LoWPANs): Overview, Assumptions, Problem Statement, and GoalsN. Kushalnagar, G. Montenegro, C. Schumacher | Informational | August 2007 |
| 4941 | Privacy Extensions for Stateless Address Autoconfiguration in IPv6T. Narten, R. Draves, S. Krishnan · obsoleted by RFC 8981 | Draft Standard | September 2007 |
| 4944 | Transmission of IPv6 Packets over IEEE 802.15.4 NetworksG. Montenegro, N. Kushalnagar, J. Hui, D. Culler | Proposed Standard | September 2007 |
| 4960 | Stream Control Transmission ProtocolR. Stewart, Ed. · obsoleted by RFC 9260 | Proposed Standard | September 2007 |
| 4987 | TCP SYN Flooding Attacks and Common MitigationsW. Eddy | Informational | August 2007 |
| 5023 | The Atom Publishing ProtocolJ. Gregorio, Ed., B. de hOra, Ed. | Proposed Standard | October 2007 |
| 5061 | Stream Control Transmission Protocol (SCTP) Dynamic Address ReconfigurationR. Stewart, Q. Xie, M. Tuexen, S. Maruyama, M. Kozuka | Proposed Standard | September 2007 |
| 5072 | IP Version 6 over PPPS. Varada, Ed., D. Haskins, E. Allen | Draft Standard | September 2007 |
| 5122 | Internationalized Resource Identifiers (IRIs) and Uniform Resource Identifiers (URIs) for the Extensible Messaging and Presence Protocol (XMPP)P. Saint-Andre | Proposed Standard | February 2008 |
| 5128 | State of Peer-to-Peer (P2P) Communication across Network Address Translators (NATs)P. Srisuresh, B. Ford, D. Kegel | Informational | March 2008 |
| 5135 | IP Multicast Requirements for a Network Address Translator (NAT) and a Network Address Port Translator (NAPT)D. Wing, T. Eckert | Best Current Practice | February 2008 |
| 5191 | Protocol for Carrying Authentication for Network Access (PANA)D. Forsberg, Y. Ohba, Ed., B. Patil, H. Tschofenig, A. Yegin | Proposed Standard | May 2008 |
| 5207 | NAT and Firewall Traversal Issues of Host Identity Protocol (HIP) CommunicationM. Stiemerling, J. Quittek, L. Eggert | Informational | April 2008 |
| 5216 | The EAP-TLS Authentication ProtocolD. Simon, B. Aboba, R. Hurst | Proposed Standard | March 2008 |
| 5238 | Datagram Transport Layer Security (DTLS) over the Datagram Congestion Control Protocol (DCCP)T. Phelan | Proposed Standard | May 2008 |
| 5246 | The Transport Layer Security (TLS) Protocol Version 1.2T. Dierks, E. Rescorla · obsoleted by RFC 8446, RFC 9846 | Proposed Standard | August 2008 |
| 5272 | Certificate Management over CMS (CMC)J. Schaad, M. Myers · obsoleted by RFC 10002 | Proposed Standard | June 2008 |
| 5277 | NETCONF Event NotificationsS. Chisholm, H. Trevino | Proposed Standard | 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 |
| 5289 | TLS Elliptic Curve Cipher Suites with SHA-256/384 and AES Galois Counter Mode (GCM)E. Rescorla | Proposed Standard | August 2008 |
| 5308 | Routing IPv6 with IS-ISC. Hopps | Proposed Standard | October 2008 |
| 5340 | OSPF for IPv6R. Coltun, D. Ferguson, J. Moy, A. Lindem | Proposed Standard | July 2008 |
| 5393 | Addressing an Amplification Vulnerability in Session Initiation Protocol (SIP) Forking ProxiesR. Sparks, Ed., S. Lawrence, A. Hawrylyshen, B. Campen | Proposed Standard | December 2008 |
| 5405 | Unicast UDP Usage Guidelines for Application DesignersL. Eggert, G. Fairhurst · obsoleted by RFC 8085 | Best Current Practice | November 2008 |
| 5430 | Suite B Profile for Transport Layer Security (TLS)M. Salter, E. Rescorla, R. Housley · obsoleted by RFC 6460 | Historic | March 2009 |
| 5433 | Extensible Authentication Protocol - Generalized Pre-Shared Key (EAP-GPSK) MethodT. Clancy, H. Tschofenig | Proposed Standard | February 2009 |
| 5437 | Sieve Notification Mechanism: Extensible Messaging and Presence Protocol (XMPP)P. Saint-Andre, A. Melnikov | Proposed Standard | January 2009 |
| 5539 | NETCONF over Transport Layer Security (TLS)M. Badra · obsoleted by RFC 7589 | Proposed Standard | May 2009 |
| 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 |
| 5548 | Routing Requirements for Urban Low-Power and Lossy NetworksM. Dohler, Ed., T. Watteyne, Ed., T. Winter, Ed., D. Barthel, Ed. | Informational | May 2009 |
| 5569 | IPv6 Rapid Deployment on IPv4 Infrastructures (6rd)R. Despres | Informational | January 2010 |
| 5621 | Message Body Handling in the Session Initiation Protocol (SIP)G. Camarillo | Proposed Standard | September 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 |
| 5652 | Cryptographic Message Syntax (CMS)R. Housley | Internet Standard | September 2009 |
| 5673 | Industrial Routing Requirements in Low-Power and Lossy NetworksK. Pister, Ed., P. Thubert, Ed., S. Dwars, T. Phinney | Informational | October 2009 |
| 5681 | TCP Congestion ControlM. Allman, V. Paxson, E. Blanton | Draft Standard | September 2009 |
| 5717 | Partial Lock Remote Procedure Call (RPC) for NETCONFB. Lengyel, M. Bjorklund | Proposed Standard | December 2009 |
| 5740 | NACK-Oriented Reliable Multicast (NORM) Transport ProtocolB. Adamson, C. Bormann, M. Handley, J. Macker | Proposed Standard | November 2009 |
| 5741 | RFC Streams, Headers, and BoilerplatesL. Daigle, Ed., O. Kolkman, Ed., IAB · obsoleted by RFC 7841 | Informational | December 2009 |
| 5751 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.2 Message SpecificationB. Ramsdell, S. Turner · obsoleted by RFC 8551 | Proposed Standard | January 2010 |
| 5785 | Defining Well-Known Uniform Resource Identifiers (URIs)M. Nottingham, E. Hammer-Lahav · obsoleted by RFC 8615 | Proposed Standard | April 2010 |
| 5826 | Home Automation Routing Requirements in Low-Power and Lossy NetworksA. Brandt, J. Buron, G. Porcu | Informational | April 2010 |
| 5838 | Support of Address Families in OSPFv3A. Lindem, Ed., S. Mirtorabi, A. Roy, M. Barnes, R. Aggarwal | Proposed Standard | April 2010 |
| 5849 | The OAuth 1.0 ProtocolE. Hammer-Lahav, Ed. · obsoleted by RFC 6749 | Informational | April 2010 |
| 5867 | Building Automation Routing Requirements in Low-Power and Lossy NetworksJ. Martocci, Ed., P. De Mil, N. Riou, W. Vermeylen | Informational | June 2010 |
| 5905 | Network Time Protocol Version 4: Protocol and Algorithms SpecificationD. Mills, J. Martin, Ed., J. Burbank, W. Kasch | Proposed Standard | June 2010 |
| 5932 | Camellia Cipher Suites for TLSA. Kato, M. Kanda, S. Kanno | Proposed Standard | June 2010 |
| 5958 | Asymmetric Key PackagesS. Turner | Proposed Standard | August 2010 |
| 5996 | Internet Key Exchange Protocol Version 2 (IKEv2)C. Kaufman, P. Hoffman, Y. Nir, P. Eronen · obsoleted by RFC 7296 | Proposed Standard | September 2010 |
| 5998 | An Extension for EAP-Only Authentication in IKEv2P. Eronen, H. Tschofenig, Y. Sheffer | Proposed Standard | September 2010 |
| 6031 | Cryptographic Message Syntax (CMS) Symmetric Key Package Content TypeS. Turner, R. Housley | Proposed Standard | December 2010 |
| 6047 | iCalendar Message-Based Interoperability Protocol (iMIP)A. Melnikov, Ed. | Proposed Standard | December 2010 |
| 6052 | IPv6 Addressing of IPv4/IPv6 TranslatorsC. Bao, C. Huitema, M. Bagnulo, M. Boucadair, X. Li | Proposed Standard | October 2010 |
| 6090 | Fundamental Elliptic Curve Cryptography AlgorithmsD. McGrew, K. Igoe, M. Salter | Informational | February 2011 |
| 6120 | Extensible Messaging and Presence Protocol (XMPP): CoreP. Saint-Andre | Proposed Standard | March 2011 |
| 6121 | Extensible Messaging and Presence Protocol (XMPP): Instant Messaging and PresenceP. Saint-Andre | Proposed Standard | March 2011 |
| 6144 | Framework for IPv4/IPv6 TranslationF. Baker, X. Li, C. Bao, K. Yin | Informational | April 2011 |
| 6145 | IP/ICMP Translation AlgorithmX. Li, C. Bao, F. Baker · obsoleted by RFC 7915 | Proposed Standard | April 2011 |
| 6146 | Stateful NAT64: Network Address and Protocol Translation from IPv6 Clients to IPv4 ServersM. Bagnulo, P. Matthews, I. van Beijnum | Proposed Standard | April 2011 |
| 6147 | DNS64: DNS Extensions for Network Address Translation from IPv6 Clients to IPv4 ServersM. Bagnulo, A. Sullivan, P. Matthews, I. van Beijnum | Proposed Standard | April 2011 |
| 6180 | Guidelines for Using IPv6 Transition Mechanisms during IPv6 DeploymentJ. Arkko, F. Baker | Informational | May 2011 |