Media Types

Last Updated

• 2026-10-09

Registration Procedure(s)

• Expert Review for Vendor and Personal Trees. For Standards Tree, see RFC 6838, Section 3.1.

Expert(s)

• Alexey Melnikov, Darrel Miller, Murray Kucherawy

Reference

• RFC 6838: Media Type Specifications and Registration Procedures
• RFC 4855: Media Type Registration of RTP Payload Formats

Note

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 6838, RFC 4289, and RFC 6657. Additional procedures for registering media types for transfer via Real-time Transport Protocol (RTP) can be found in RFC 4855.

Per Section 3.1 of RFC 6838, Standards Tree requests made through IETF documents will be reviewed and approved by the IESG, while requests made by other recognized standards organizations will be reviewed by the Designated Expert in accordance with the Specification Required policy. IANA will verify that this organization is recognized as a standards organization by the IESG.

Note

Some early registrations have no registration template. The absence of a template does not imply a different or reduced registration status.

Note

Per Section 12.5.1 of RFC 9110, use of the "q" parameter name to control content negotiation would interfere with any media type parameter having the same name. Hence, the media type registry disallows parameters named "q".

Related Registries

• Top-Level Media Types
• Provisional Standard Media Type Registry
• Other Media Type Parameters
• Media Type Sub-Parameters

Registration Forms

• To request a new assignment, please submit the Media Types Request Form.
• To update an existing assignment, please send the request to iana@iana.org.

Available Formats

• XML
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application

Available Formats

• CSV