Related links

About language subtags

PHP source code

IANA subtag registry

Notes

Descriptions You can search on any part of a description (eg. 'eng' gives 8 results, including Bengali, English and Tengwar).

Subtags Only exact matches of subtags are returned, ie. 'ak' doesn't match 'akk'. If you enter a single subtag, the tool will search for any matches. If you enter a hyphen-separated list, the tool will look up potential matches for each subtag.

Validity and well-formedness This is not reported for hyphen-separated tags. If the results are in a different order than the hyphenated list, or there are duplicate subtags in one category, or there are subtags missing from the results (except for a private use sequence of the form x-...) then it is likely that there is a problem with the sequence you searched on.

Grandfathered tags are pre-RFC 4646 registrations of tags that cannot be completely composed from the subtags in the current registry. If you search for a grandfathered tag it will be displayed in the results, and the subtags that are in the current registry will also be shown.

Redundant tags are pre-RFC 4646 registrations of tags that can now be formed by combining separate subtags from the current registry. They do not show up in search results.