| 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 |
| 821 | Simple Mail Transfer ProtocolJ. Postel · obsoleted by RFC 2821 | Internet Standard | August 1982 |
| 822 | STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGESD. Crocker · obsoleted by RFC 2822 | Internet Standard | August 1982 |
| 854 | Telnet Protocol SpecificationJ. Postel, J.K. Reynolds | Internet Standard | May 1983 |
| 959 | File Transfer ProtocolJ. Postel, J. Reynolds | Internet Standard | October 1985 |
| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1042 | Standard for the transmission of IP datagrams over IEEE 802 networksJ. Postel, J.K. Reynolds | Internet Standard | February 1988 |
| 1108 | U.S. Department of Defense Security Options for the Internet ProtocolS. Kent | Historic | November 1991 |
| 1135 | Helminthiasis of the InternetJ.K. Reynolds | Informational | December 1989 |
| 1157 | Simple Network Management Protocol (SNMP)J.D. Case, M. Fedor, M.L. Schoffstall, J. Davin | Historic | May 1990 |
| 1208 | A Glossary of Networking TermsO.J. Jacobsen, D.C. Lynch | Informational | March 1991 |
| 1281 | Guidelines for the Secure Operation of the InternetR. Pethia, S. Crocker, B. Fraser | Informational | November 1991 |
| 1319 | The MD2 Message-Digest AlgorithmB. Kaliski · obsoleted by RFC 6149 | Historic | April 1992 |
| 1320 | The MD4 Message-Digest AlgorithmR. Rivest · obsoleted by RFC 6150 | Historic | April 1992 |
| 1321 | The MD5 Message-Digest AlgorithmR. Rivest | Informational | April 1992 |
| 1334 | PPP Authentication ProtocolsB. Lloyd, W. Simpson · obsoleted by RFC 1994 | Proposed Standard | October 1992 |
| 1413 | Identification ProtocolM. St. Johns | Proposed Standard | February 1993 |
| 1421 | Privacy Enhancement for Internet Electronic Mail: Part I: Message Encryption and Authentication ProceduresJ. Linn | Historic | February 1993 |
| 1422 | Privacy Enhancement for Internet Electronic Mail: Part II: Certificate-Based Key ManagementS. Kent | Historic | February 1993 |
| 1455 | Physical Link Security Type of ServiceD. Eastlake 3rd · obsoleted by RFC 2474 | Experimental | May 1993 |
| 1457 | Security Label Framework for the InternetR. Housley | Informational | May 1993 |
| 1492 | An Access Control Protocol, Sometimes Called TACACSC. Finseth | Informational | July 1993 |
| 1507 | DASS - Distributed Authentication Security ServiceC. Kaufman | Experimental | September 1993 |
| 1661 | The Point-to-Point Protocol (PPP)W. Simpson, Ed. | Internet Standard | July 1994 |
| 1731 | IMAP4 Authentication MechanismsJ. Myers | Proposed Standard | December 1994 |
| 1734 | POP3 AUTHentication commandJ. Myers · obsoleted by RFC 5034 | Proposed Standard | December 1994 |
| 1760 | The S/KEY One-Time Password SystemN. Haller | Informational | February 1995 |
| 1771 | A Border Gateway Protocol 4 (BGP-4)Y. Rekhter, T. Li · obsoleted by RFC 4271 | Draft Standard | March 1995 |
| 1822 | A Grant of Rights to Use a Specific IBM patent with PhoturisJ. Lowe | Informational | August 1995 |
| 1824 | The Exponential Security System TESS: An Identity-Based Cryptographic Protocol for Authenticated Key-Exchange (E.I.S.S.-Report 1995/4)H. Danisch | Informational | August 1995 |
| 1828 | IP Authentication using Keyed MD5P. Metzger, W. Simpson | Historic | August 1995 |
| 1829 | The ESP DES-CBC TransformP. Karn, P. Metzger, W. Simpson | Proposed Standard | August 1995 |
| 1848 | MIME Object Security ServicesS. Crocker, N. Freed, J. Galvin, S. Murphy | Historic | October 1995 |
| 1851 | The ESP Triple DES TransformP. Karn, P. Metzger, W. Simpson | Experimental | September 1995 |
| 1901 | Introduction to Community-based SNMPv2J. Case, K. McCloghrie, M. Rose, S. Waldbusser | Historic | January 1996 |
| 1928 | SOCKS Protocol Version 5M. Leech, M. Ganis, Y. Lee, R. Kuris, D. Koblas, L. Jones | Proposed Standard | March 1996 |
| 1939 | Post Office Protocol - Version 3J. Myers, M. Rose | Internet Standard | May 1996 |
| 1958 | Architectural Principles of the InternetB. Carpenter, Ed. | Informational | June 1996 |
| 1983 | Internet Users' GlossaryG. Malkin, Ed. | Informational | August 1996 |
| 1994 | PPP Challenge Handshake Authentication Protocol (CHAP)W. Simpson | Draft Standard | August 1996 |
| 2026 | The Internet Standards Process -- Revision 3S. Bradner | Best Current Practice | October 1996 |
| 2045 | Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message BodiesN. Freed, N. Borenstein | Draft Standard | November 1996 |
| 2060 | Internet Message Access Protocol - Version 4rev1M. Crispin · obsoleted by RFC 3501 | Proposed Standard | December 1996 |
| 2078 | Generic Security Service Application Program Interface, Version 2J. Linn · obsoleted by RFC 2743 | Proposed Standard | January 1997 |
| 2084 | Considerations for Web Transaction SecurityG. Bossert, S. Cooper, W. Drummond | Informational | January 1997 |
| 2104 | HMAC: Keyed-Hashing for Message AuthenticationH. Krawczyk, M. Bellare, R. Canetti | Informational | February 1997 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2141 | URN SyntaxR. Moats · obsoleted by RFC 8141 | Proposed Standard | May 1997 |
| 2144 | The CAST-128 Encryption AlgorithmC. Adams | Informational | May 1997 |
| 2179 | Network Security For Trade ShowsA. Gwinn | Informational | July 1997 |
| 2196 | Site Security HandbookB. Fraser | Informational | September 1997 |
| 2202 | Test Cases for HMAC-MD5 and HMAC-SHA-1P. Cheng, R. Glenn | Informational | September 1997 |
| 2222 | Simple Authentication and Security Layer (SASL)J. Myers · obsoleted by RFC 4422, RFC 4752 | Proposed Standard | October 1997 |
| 2289 | A One-Time Password SystemN. Haller, C. Metz, P. Nesser, M. Straw | Internet Standard | February 1998 |
| 2315 | PKCS #7: Cryptographic Message Syntax Version 1.5B. Kaliski | Informational | March 1998 |
| 2323 | IETF Identification and Security GuidelinesA. Ramos | Informational | 1 April 1998 |
| 2350 | Expectations for Computer Security Incident ResponseN. Brownlee, E. Guttman | Best Current Practice | June 1998 |
| 2356 | Sun's SKIP Firewall Traversal for Mobile IPG. Montenegro, V. Gupta | Informational | June 1998 |
| 2373 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering · obsoleted by RFC 3513 | Proposed Standard | July 1998 |
| 2401 | Security Architecture for the Internet ProtocolS. Kent, R. Atkinson · obsoleted by RFC 4301 | Proposed Standard | November 1998 |
| 2402 | IP Authentication HeaderS. Kent, R. Atkinson · obsoleted by RFC 4302, RFC 4305 | Proposed Standard | November 1998 |
| 2403 | The Use of HMAC-MD5-96 within ESP and AHC. Madson, R. Glenn | Proposed Standard | November 1998 |
| 2404 | The Use of HMAC-SHA-1-96 within ESP and AHC. Madson, R. Glenn | Proposed Standard | November 1998 |
| 2405 | The ESP DES-CBC Cipher Algorithm With Explicit IVC. Madson, N. Doraswamy | Proposed Standard | November 1998 |
| 2406 | IP Encapsulating Security Payload (ESP)S. Kent, R. Atkinson · obsoleted by RFC 4303, RFC 4305 | Proposed Standard | November 1998 |
| 2407 | The Internet IP Security Domain of Interpretation for ISAKMPD. Piper · obsoleted by RFC 4306 | Historic | November 1998 |
| 2408 | Internet Security Association and Key Management Protocol (ISAKMP)D. Maughan, M. Schertler, M. Schneider, J. Turner · obsoleted by RFC 4306 | Historic | November 1998 |
| 2410 | The NULL Encryption Algorithm and Its Use With IPsecR. Glenn, S. Kent | Proposed Standard | November 1998 |
| 2451 | The ESP CBC-Mode Cipher AlgorithmsR. Pereira, R. Adams | Proposed Standard | November 1998 |
| 2460 | Internet Protocol, Version 6 (IPv6) SpecificationS. Deering, R. Hinden · obsoleted by RFC 8200 | Draft Standard | December 1998 |
| 2504 | Users' Security HandbookE. Guttman, L. Leong, G. Malkin | Informational | February 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 |
| 2612 | The CAST-256 Encryption AlgorithmC. Adams, J. Gilchrist | Informational | 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 |
| 2628 | Simple Cryptographic Program Interface (Crypto API)V. Smyslov | Informational | June 1999 |
| 2635 | DON'T SPEW A Set of Guidelines for Mass Unsolicited Mailings and Postings (spam*)S. Hambridge, A. Lunde | Informational | June 1999 |
| 2637 | Point-to-Point Tunneling Protocol (PPTP)K. Hamzeh, G. Pall, W. Verthein, J. Taarud, W. Little, G. Zorn | Informational | July 1999 |
| 2660 | The Secure HyperText Transfer ProtocolE. Rescorla, A. Schiffman | Historic | August 1999 |
| 2743 | Generic Security Service Application Program Interface Version 2, Update 1J. Linn | Proposed Standard | January 2000 |
| 2773 | Encryption using KEA and SKIPJACKR. Housley, P. Yee, W. Nace | Experimental | February 2000 |
| 2801 | Internet Open Trading Protocol - IOTP Version 1.0D. Burdett | Informational | April 2000 |
| 2827 | Network Ingress Filtering: Defeating Denial of Service Attacks which employ IP Source Address SpoofingP. Ferguson, D. Senie | Best Current Practice | May 2000 |
| 2828 | Internet Security GlossaryR. Shirey · obsoleted by RFC 4949 | Informational | May 2000 |
| 2845 | Secret Key Transaction Authentication for DNS (TSIG)P. Vixie, O. Gudmundsson, D. Eastlake 3rd, B. Wellington · obsoleted by RFC 8945 | Proposed Standard | May 2000 |
| 2865 | Remote Authentication Dial In User Service (RADIUS)C. Rigney, S. Willens, A. Rubens, W. Simpson | Draft Standard | June 2000 |
| 2898 | PKCS #5: Password-Based Cryptography Specification Version 2.0B. Kaliski · obsoleted by RFC 8018 | Informational | September 2000 |
| 2930 | Secret Key Establishment for DNS (TKEY RR)D. Eastlake 3rd | Proposed Standard | September 2000 |
| 2986 | PKCS #10: Certification Request Syntax Specification Version 1.7M. Nystrom, B. Kaliski | Informational | November 2000 |
| 3060 | Policy Core Information Model -- Version 1 SpecificationB. Moore, E. Ellesson, J. Strassner, A. Westerinen | Proposed Standard | February 2001 |
| 3161 | Internet X.509 Public Key Infrastructure Time-Stamp Protocol (TSP)C. Adams, P. Cain, D. Pinkas, R. Zuccherato | Proposed Standard | August 2001 |
| 3198 | Terminology for Policy-Based ManagementA. Westerinen, J. Schnizlein, J. Strassner, M. Scherling, B. Quinn, S. Herzog, A. Huynh, M. Carlson, J. Perry, S. Waldbusser | Informational | November 2001 |
| 3280 | Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) ProfileR. Housley, W. Polk, W. Ford, D. Solo · obsoleted by RFC 5280 | Proposed Standard | May 2002 |
| 3377 | Lightweight Directory Access Protocol (v3): Technical SpecificationJ. Hodges, R. Morgan · obsoleted by RFC 4510 | Proposed Standard | September 2002 |
| 3547 | The Group Domain of InterpretationM. Baugher, B. Weis, T. Hardjono, H. Harney · obsoleted by RFC 6407 | Proposed Standard | July 2003 |
| 3552 | Guidelines for Writing RFC Text on Security ConsiderationsE. Rescorla, B. Korver | Best Current Practice | July 2003 |
| 3647 | Internet X.509 Public Key Infrastructure Certificate Policy and Certification Practices FrameworkS. Chokhani, W. Ford, R. Sabett, C. Merrill, S. Wu | Informational | November 2003 |
| 3720 | Internet Small Computer Systems Interface (iSCSI)J. Satran, K. Meth, C. Sapuntzakis, M. Chadalapaka, E. Zeidner · obsoleted by RFC 7143 | Proposed Standard | April 2004 |
| 3739 | Internet X.509 Public Key Infrastructure: Qualified Certificates ProfileS. Santesson, M. Nystrom, T. Polk | Proposed Standard | March 2004 |
| 3740 | The Multicast Group Security ArchitectureT. Hardjono, B. Weis | Informational | March 2004 |
| 3753 | Mobility Related TerminologyJ. Manner, Ed., M. Kojo, Ed. | Informational | June 2004 |
| 3766 | Determining Strengths For Public Keys Used For Exchanging Symmetric KeysH. Orman, P. Hoffman | Best Current Practice | April 2004 |
| 3820 | Internet X.509 Public Key Infrastructure (PKI) Proxy Certificate ProfileS. Tuecke, V. Welch, D. Engert, L. Pearlman, M. Thompson | Proposed Standard | June 2004 |
| 3851 | Secure/Multipurpose Internet Mail Extensions (S/MIME) Version 3.1 Message SpecificationB. Ramsdell, Ed. · obsoleted by RFC 5751 | Proposed Standard | July 2004 |
| 3852 | Cryptographic Message Syntax (CMS)R. Housley · obsoleted by RFC 5652 | Proposed Standard | July 2004 |
| 3871 | Operational Security Requirements for Large Internet Service Provider (ISP) IP Network InfrastructureG. Jones, Ed. | Informational | September 2004 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 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 |
| 4086 | Randomness Requirements for SecurityD. Eastlake 3rd, J. Schiller, S. Crocker | Best Current Practice | June 2005 |
| 4120 | The Kerberos Network Authentication Service (V5)C. Neuman, T. Yu, S. Hartman, K. Raeburn | Proposed Standard | July 2005 |
| 4158 | Internet X.509 Public Key Infrastructure: Certification Path BuildingM. Cooper, Y. Dzambasow, P. Hesse, S. Joseph, R. Nicholas | Informational | September 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 |
| 4211 | Internet X.509 Public Key Infrastructure Certificate Request Message Format (CRMF)J. Schaad | Proposed Standard | September 2005 |
| 4301 | Security Architecture for the Internet ProtocolS. Kent, K. Seo | Proposed Standard | December 2005 |
| 4302 | IP Authentication HeaderS. Kent | Proposed Standard | December 2005 |
| 4346 | The Transport Layer Security (TLS) Protocol Version 1.1T. Dierks, E. Rescorla · obsoleted by RFC 5246 | Historic | April 2006 |
| 4422 | Simple Authentication and Security Layer (SASL)A. Melnikov, Ed., K. Zeilenga, Ed. | Proposed Standard | June 2006 |
| 4556 | Public Key Cryptography for Initial Authentication in Kerberos (PKINIT)L. Zhu, B. Tung | Proposed Standard | June 2006 |