ID registry

FLAC allows third-party applications to register an ID for use with FLAC APPLICATION metadata blocks. This page used to function as a registry for such IDs, but this registry has been moved to the IANA. Visit https://www.iana.org/assignments/flac/flac.xhtml to view the registry.

To register an ID, file a request via https://www.iana.org/form/protocol-assignment. Your request should at least contain the application ID, application name and a contact e-mail address. Preferably, an URL to a webpage with a specifiction belonging to the ID is included too.

The requested ID must be 8 hexadecimal digits and not conflict with any existing IDs (see the IANA registry for all currently registered IDs). This 32-bit number will be stored big-endian in the block.