Free Lossless Audio Codec (FLAC)

Created
2024-03-01
Last Updated
2026-10-09
Available Formats

XML
HTML
TXT

Registry Included Below

FLAC Application Metadata Block IDs

Registration Procedure(s)
First Come First Served
Reference
[RFC 9639]
Available Formats

CSV
Application ID ASCII Rendition (If Available) Description Reference Change Controller
0x41544348 ATCH FlacFile [FlacFile][RFC 9639] IETF
0x42534F4C BSOL beSolo [RFC 9639] IETF
0x42554753 BUGS Bugs Player [RFC 9639] IETF
0x43756573 Cues GoldWave cue points [RFC 9639] IETF
0x44495343 DISC Red Book CD-DA LBA track layouts, TOC/CUE structures, verification logs, and additional data for audio preservation [Angel_Garcia_Rodriguez] [Angel_Garcia_Rodriguez]
0x46696361 Fica CUE Splitter [RFC 9639] IETF
0x46746F6C Ftol flac-tools [RFC 9639] IETF
0x4D4F5442 MOTB MOTB MetaCzar [RFC 9639] IETF
0x4D505345 MPSE MP3 Stream Editor [RFC 9639] IETF
0x4D754D4C MuML MusicML: Music Metadata Language [RFC 9639] IETF
0x52494646 RIFF Sound Devices RIFF chunk storage [RFC 9639] IETF
0x5346464C SFFL Sound Font FLAC [RFC 9639] IETF
0x534F4E59 SONY Sony Creative Software [RFC 9639] IETF
0x5351455A SQEZ flacsqueeze [RFC 9639] IETF
0x54745776 TtWv TwistedWave [RFC 9639] IETF
0x55495453 UITS UITS Embedding tools [RFC 9639] IETF
0x61696666 aiff FLAC AIFF chunk storage [foreign-metadata][RFC 9639] IETF
0x696D6167 imag flac-image [RFC 9639] IETF
0x7065656D peem Parseable Embedded Extensible Metadata [RFC 9639] IETF
0x71667374 qfst QFLAC Studio [RFC 9639] IETF
0x72696666 riff FLAC RIFF chunk storage [foreign-metadata][RFC 9639] IETF
0x74756E65 tune TagTuner [RFC 9639] IETF
0x77363420 w64 [1] FLAC Wave64 chunk storage [foreign-metadata][RFC 9639] IETF
0x78626174 xbat XBAT [RFC 9639] IETF
0x786D6364 xmcd xmcd [RFC 9639] IETF

Contact Information

ID Name Contact URI Last Updated
[Angel_Garcia_Rodriguez] Angel Garcia Rodriguez mailto:angelgar&gmail.com 2026-10-09

Footnote

[1] 
The value is "w64 " with a single space in order to be four bytes.