| 1034 | Domain names - concepts and facilitiesP. Mockapetris | Internet Standard | November 1987 |
| 1035 | Domain names - implementation and specificationP. Mockapetris | Internet Standard | November 1987 |
| 1123 | Requirements for Internet Hosts - Application and SupportR. Braden, Ed. | Internet Standard | October 1989 |
| 1983 | Internet Users' GlossaryG. Malkin, Ed. | Informational | August 1996 |
| 2119 | Key words for use in RFCs to Indicate Requirement LevelsS. Bradner | Best Current Practice | March 1997 |
| 2308 | Negative Caching of DNS Queries (DNS NCACHE)M. Andrews | Proposed Standard | March 1998 |
| 2671 | Extension Mechanisms for DNS (EDNS0)P. Vixie · obsoleted by RFC 6891 | Proposed Standard | August 1999 |
| 2782 | A DNS RR for specifying the location of services (DNS SRV)A. Gulbrandsen, P. Vixie, L. Esibov | Proposed Standard | February 2000 |
| 3463 | Enhanced Mail System Status CodesG. Vaudreuil | Draft Standard | January 2003 |
| 3464 | An Extensible Message Format for Delivery Status NotificationsK. Moore, G. Vaudreuil | Draft Standard | January 2003 |
| 3696 | Application Techniques for Checking and Transformation of NamesJ. Klensin | Informational | February 2004 |
| 3833 | Threat Analysis of the Domain Name System (DNS)D. Atkins, R. Austein | Informational | August 2004 |
| 3834 | Recommendations for Automatic Responses to Electronic MailK. Moore | Proposed Standard | August 2004 |
| 3864 | Registration Procedures for Message Header FieldsG. Klyne, M. Nottingham, J. Mogul | Best Current Practice | September 2004 |
| 3986 | Uniform Resource Identifier (URI): Generic SyntaxT. Berners-Lee, R. Fielding, L. Masinter | Internet Standard | January 2005 |
| 4033 | DNS Security Introduction and RequirementsR. Arends, R. Austein, M. Larson, D. Massey, S. Rose | Proposed Standard | March 2005 |
| 4291 | IP Version 6 Addressing ArchitectureR. Hinden, S. Deering | Draft Standard | February 2006 |
| 4408 | Sender Policy Framework (SPF) for Authorizing Use of Domains in E-Mail, Version 1M. Wong, W. Schlitt · obsoleted by RFC 7208 | Experimental | April 2006 |
| 4632 | Classless Inter-domain Routing (CIDR): The Internet Address Assignment and Aggregation PlanV. Fuller, T. Li | Best Current Practice | August 2006 |
| 4880 | OpenPGP Message FormatJ. Callas, L. Donnerhacke, H. Finney, D. Shaw, R. Thayer · obsoleted by RFC 9580 | Proposed Standard | November 2007 |
| 4954 | SMTP Service Extension for AuthenticationR. Siemborski, Ed., A. Melnikov, Ed. | Proposed Standard | July 2007 |
| 5234 | Augmented BNF for Syntax Specifications: ABNFD. Crocker, Ed., P. Overell | Internet Standard | January 2008 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5322 | Internet Message FormatP. Resnick, Ed. | Draft Standard | October 2008 |
| 5507 | Design Choices When Expanding the DNSIAB, P. Faltstrom, Ed., R. Austein, Ed., P. Koch, Ed. | Informational | April 2009 |
| 5598 | Internet Mail ArchitectureD. Crocker | Informational | July 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 |
| 5782 | DNS Blacklists and WhitelistsJ. Levine | Informational | February 2010 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 6409 | Message Submission for MailR. Gellens, J. Klensin | Internet Standard | November 2011 |
| 6647 | Email Greylisting: An Applicability Statement for SMTPM. Kucherawy, D. Crocker | Proposed Standard | June 2012 |
| 6648 | Deprecating the "X-" Prefix and Similar Constructs in Application ProtocolsP. Saint-Andre, D. Crocker, M. Nottingham | Best Current Practice | June 2012 |
| 6652 | Sender Policy Framework (SPF) Authentication Failure Reporting Using the Abuse Reporting FormatS. Kitterman | Proposed Standard | June 2012 |
| 6686 | Resolution of the Sender Policy Framework (SPF) and Sender ID ExperimentsM. Kucherawy | Informational | July 2012 |
| 6891 | Extension Mechanisms for DNS (EDNS(0))J. Damas, M. Graff, P. Vixie | Internet Standard | April 2013 |
| 7001 | Message Header Field for Indicating Message Authentication StatusM. Kucherawy · obsoleted by RFC 7601 | Proposed Standard | September 2013 |