| 9422 | The LIMITS SMTP Service ExtensionN. Freed, J. Klensin | Proposed Standard | February 2024 |
| 8753 | Internationalized Domain Names for Applications (IDNA) Review for New Unicode VersionsJ. Klensin, P. Fältström | Proposed Standard | April 2020 |
| 8722 | Defining the Role and Function of IETF Protocol Parameter Registry OperatorsD. McPherson, Ed., O. Kolkman, Ed., J. Klensin, Ed., G. Huston, Ed. | Informational | February 2020 |
| 8717 | IETF Administrative Support Activity 2.0: Consolidated Updates to IETF Administrative TerminologyJ. Klensin, Ed. | Best Current Practice | February 2020 |
| 8324 | DNS Privacy, Authorization, Special Uses, Encoding, Characters, Matching, and Root Structure: Time for Another Look?J. Klensin | Informational | February 2018 |
| 8254 | Uniform Resource Name (URN) Namespace Registration TransitionJ. Klensin, J. Hakala | Proposed Standard | October 2017 |
| 8141 | Uniform Resource Names (URNs)P. Saint-Andre, J. Klensin | Proposed Standard | April 2017 |
| 7504 | SMTP 521 and 556 Reply CodesJ. Klensin | Proposed Standard | June 2015 |
| 6912 | Principles for Unicode Code Point Inclusion in Labels in the DNSA. Sullivan, D. Thaler, J. Klensin, O. Kolkman | Informational | April 2013 |
| 6838 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin, T. Hansen | Best Current Practice | January 2013 |
| 6530 | Overview and Framework for Internationalized EmailJ. Klensin, Y. Ko | Proposed Standard | February 2012 |
| 6409 | Message Submission for MailR. Gellens, J. Klensin | Internet Standard | November 2011 |
| 6365 | Terminology Used in Internationalization in the IETFP. Hoffman, J. Klensin | Best Current Practice | September 2011 |
| 6220 | Defining the Role and Function of IETF Protocol Parameter Registry OperatorsD. McPherson, Ed., O. Kolkman, Ed., J. Klensin, Ed., G. Huston, Ed., Internet Architecture Board · obsoleted by RFC 8722 | Informational | April 2011 |
| 6152 | SMTP Service Extension for 8-bit MIME TransportJ. Klensin, N. Freed, M. Rose, D. Crocker, Ed. | Internet Standard | March 2011 |
| 6082 | Deprecating Unicode Language Tag Characters: RFC 2482 is HistoricK. Whistler, G. Adams, M. Duerst, R. Presuhn, Ed., J. Klensin | Informational | November 2010 |
| 6055 | IAB Thoughts on Encodings for Internationalized Domain NamesD. Thaler, J. Klensin, S. Cheshire | Informational | February 2011 |
| 5992 | Internationalized Domain Names Registration and Administration Guidelines for European Languages Using CyrillicS. Sharikov, D. Miloshevic, J. Klensin | Informational | October 2010 |
| 5894 | Internationalized Domain Names for Applications (IDNA): Background, Explanation, and RationaleJ. Klensin | Informational | August 2010 |
| 5891 | Internationalized Domain Names in Applications (IDNA): ProtocolJ. Klensin | Proposed Standard | August 2010 |
| 5890 | Internationalized Domain Names for Applications (IDNA): Definitions and Document FrameworkJ. Klensin | Proposed Standard | August 2010 |
| 5797 | FTP Command and Extension RegistryJ. Klensin, A. Hoenes | Proposed Standard | March 2010 |
| 5321 | Simple Mail Transfer ProtocolJ. Klensin | Draft Standard | October 2008 |
| 5248 | A Registry for SMTP Enhanced Mail System Status CodesT. Hansen, J. Klensin | Best Current Practice | June 2008 |
| 5242 | A Generalized Unified Character Code: Western European and CJK SectionsJ. Klensin, H. Alvestrand | Informational | 1 April 2008 |
| 5198 | Unicode Format for Network InterchangeJ. Klensin, M. Padlipsky | Proposed Standard | March 2008 |
| 5137 | ASCII Escaping of Unicode CharactersJ. Klensin | Best Current Practice | February 2008 |
| 4952 | Overview and Framework for Internationalized EmailJ. Klensin, Y. Ko · obsoleted by RFC 6530 | Informational | July 2007 |
| 4897 | Handling Normative References to Standards-Track DocumentsJ. Klensin, S. Hartman | Best Current Practice | June 2007 |
| 4846 | Independent Submissions to the RFC EditorJ. Klensin, Ed., D. Thaler, Ed. | Informational | July 2007 |
| 4713 | Registration and Administration Recommendations for Chinese Domain NamesX. Lee, W. Mao, E. Chen, N. Hsu, J. Klensin | Informational | October 2006 |
| 4690 | Review and Recommendations for Internationalized Domain Names (IDNs)J. Klensin, P. Faltstrom, C. Karp, IAB | Informational | September 2006 |
| 4409 | Message Submission for MailR. Gellens, J. Klensin · obsoleted by RFC 6409 | Draft Standard | April 2006 |
| 4290 | Suggested Practices for Registration of Internationalized Domain Names (IDN)J. Klensin | Informational | December 2005 |
| 4289 | Multipurpose Internet Mail Extensions (MIME) Part Four: Registration ProceduresN. Freed, J. Klensin | Best Current Practice | December 2005 |
| 4288 | Media Type Specifications and Registration ProceduresN. Freed, J. Klensin · obsoleted by RFC 6838 | Best Current Practice | December 2005 |
| 4185 | National and Local Characters for DNS Top Level Domain (TLD) NamesJ. Klensin | Informational | October 2005 |
| 4084 | Terminology for Describing Internet ConnectivityJ. Klensin | Best Current Practice | May 2005 |
| 3933 | A Model for IETF Process ExperimentsJ. Klensin, S. Dawkins | Best Current Practice | November 2004 |
| 3696 | Application Techniques for Checking and Transformation of NamesJ. Klensin | Informational | February 2004 |
| 3467 | Role of the Domain Name System (DNS)J. Klensin | Informational | March 2003 |
| 3245 | The History and Context of Telephone Number Mapping (ENUM) Operational Decisions: Informational Documents Contributed to ITU-T Study Group 2 (SG2)J. Klensin, Ed., IAB | Informational | March 2002 |
| 3113 | 3GPP-IETF Standardization CollaborationK. Rosenbrock, R. Sanmugam, S. Bradner, J. Klensin | Informational | June 2001 |
| 3109 | Request to Move STD 39 to Historic StatusR. Braden, R. Bush, J. Klensin | Informational | May 2001 |
| 3071 | Reflections on the DNS, RFC 1591, and Categories of DomainsJ. Klensin | Informational | February 2001 |
| 2901 | Guide to Administrative Procedures of the Internet InfrastructureZ. Wenzel, J. Klensin, R. Bush, S. Huter | Informational | August 2000 |
| 2821 | Simple Mail Transfer ProtocolJ. Klensin, Ed. · obsoleted by RFC 5321 | Proposed Standard | April 2001 |
| 2476 | Message SubmissionR. Gellens, J. Klensin · obsoleted by RFC 4409 | Proposed Standard | December 1998 |
| 2345 | Domain Names and Company Name RetrievalJ. Klensin, T. Wolf, G. Oglesby | Experimental | May 1998 |
| 2195 | IMAP/POP AUTHorize Extension for Simple Challenge/ResponseJ. Klensin, R. Catoe, P. Krumviede | Proposed Standard | September 1997 |
| 2095 | IMAP/POP AUTHorize Extension for Simple Challenge/ResponseJ. Klensin, R. Catoe, P. Krumviede · obsoleted by RFC 2195 | Proposed Standard | January 1997 |
| 2048 | Multipurpose Internet Mail Extensions (MIME) Part Four: Registration ProceduresN. Freed, J. Klensin, J. Postel · obsoleted by RFC 4288, RFC 4289 | Best Current Practice | November 1996 |
| 1870 | SMTP Service Extension for Message Size DeclarationJ. Klensin, N. Freed, K. Moore | Internet Standard | November 1995 |
| 1869 | SMTP Service ExtensionsJ. Klensin, N. Freed, M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 2821 | Internet Standard | November 1995 |
| 1653 | SMTP Service Extension for Message Size DeclarationJ. Klensin, N. Freed, K. Moore · obsoleted by RFC 1870 | Draft Standard | July 1994 |
| 1652 | SMTP Service Extension for 8bit-MIMEtransportJ. Klensin, N. Freed, M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 6152 | Draft Standard | July 1994 |
| 1651 | SMTP Service ExtensionsJ. Klensin, N. Freed, M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 1869 | Draft Standard | July 1994 |
| 1427 | SMTP Service Extension for Message Size DeclarationJ. Klensin, N. Freed, Ed., K. Moore · obsoleted by RFC 1653 | Proposed Standard | February 1993 |
| 1426 | SMTP Service Extension for 8bit-MIMEtransportJ. Klensin, N. Freed, Ed., M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 1652 | Proposed Standard | February 1993 |
| 1425 | SMTP Service ExtensionsJ. Klensin, N. Freed, Ed., M. Rose, E. Stefferud, D. Crocker · obsoleted by RFC 1651 | Proposed Standard | February 1993 |