Updates to the IANA Registration Procedures for Constrained Application Protocol Content-Formats
RFC 9876, “Updates to the IANA Registration Procedures for Constrained Application Protocol Content-Formats”, is a Proposed Standard document published in November 2025 by T. Fossati, E. Dijk. It updates RFC 7252. The canonical text is published by the RFC Editor.
Abstract
This document updates RFC 7252 by modifying the registration procedures for the "CoAP Content-Formats" IANA registry, within the "Constrained RESTful Environments (CoRE) Parameters" registry group. This document also introduces a new column, "Media Type", to the registry. Furthermore, this document reserves Content-Format identifiers 64998 and 64999 for use in documentation.
What “Proposed Standard” means
An entry-level standards-track specification: stable, peer-reviewed and a solid basis for implementation, though it may still evolve before becoming an Internet Standard.
The canonical text of RFC 9876 is hosted at rfc-editor.org. Available in HTML,TXT,PDF,XML.
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