RFC 9876 - Updates to the IANA Registration Procedures for Constrained Application Protocol (CoAP) Content-Formats

• Status: Proposed Standard
• Published: November 2025
• Stream: IETF
• Updates: RFC 7252
• Errata: RFC Editor Errata

Abstract

This document updates RFC 7252 by modifying the IANA registration procedures for CoAP Content-Formats, adding a Media Type column, and reserving Content-Format identifiers 64998 and 64999 for documentation.

Contents

• 1. Introduction
• 2. Conventions and Definitions
• 3. Security Considerations
• 4. IANA Considerations
• 4.1. CoAP Content-Formats Registry
• 4.1.1. Temporary Content-Format Registrations
• 4.1.2. Addition of the Media Type Column to the Registry
• 4.1.3. Expert Review Procedure
• 4.1.4. Preferred Format for the Content Type Field
• 4.1.5. Examples of Invalid Registration Requests
• 4.2. New Note and Reference Additions
• 4.3. Reserving Content-Format Identifiers 64998 and 64999 for Documentation
• 5. References
• Acknowledgments
• Authors' Addresses

Related Resources

• Official Text: RFC 9876
• Official Page: RFC 9876 DataTracker
• Errata: RFC Editor Errata