MIME Media Types
RFC 2046 specifies that Media Types (formerly known as MIME types) and Media Subtypes will be assigned and listed by the IANA.
Procedures for registering Media Types can be found in
RFC 4289, and
Additional procedures for registering media types for transfer via Real-time Transport Protocol (RTP) can be found in RFC 4855.
The following is the list of Directories of Content Types and Subtypes:
If you wish to register a Media Type with the IANA, please see the following for the online application:
Application for registration of Media Types
Other Media Type Parameters