Files available here were automatically produced from the official registry maintained by IANA. The current version of the registry is .

Official format
As text files (one line per record, fields separated by tabulations, the subtag is the first field, the addition date the second):
- List of languages
- List of scripts
- List of regions (including countries)
- List of variants (orthography, local dialects)
- List of grand-fathered (tags which would otherwise be illegal but are maintained for compatibility, because they were previously used)
- List of redundants (subtags redundant with other subtags)
As HTML:
- List of languages
- List of scripts
- List of regions (including countries)
- List of variants (orthography, local dialects)
- List of grand-fathered (tags which would otherwise be illegal but are maintained for compatibility, because they were previously used)
- List of redundants (subtags redundant with other subtags)
As XML :
- According to this schema (written in RelaxNG): registry in XML, Stéphane Bortzmeyer's version
As SQL. Since SQL is not really portable, there are several versions :
- For PostgreSQL (create the database with this schema) : registry in SQL,
- For SQLite (create the database with this schema) : registry in SQL,