Proactively Assigning CoAP Content-Format Numbers to Registered Media Types

Document Type Expired Internet-Draft (individual)
Authors Carsten Bormann  , Klaus Hartke 
Last updated 2019-01-03 (latest revision 2018-07-02)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


In order to use a media type with the Constrained Application Protocol (CoAP), a numeric identifier needs to be registered for it, the Content-Format number. RFC 7252 defines registration procedures for Content-Format numbers. The present document defines a proactive procedure to register a Content-Format number for many of the media types that are registered and discusses the benefits and limitations of that approach.


Carsten Bormann (
Klaus Hartke (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)