Codes For Constructed Languages
This is a list of ISO 639 codes and IETF language tags (BCP 47) for individual constructed languages, complete as of November 2009.
ISO 639-2 and ISO 639-5 also have the code art for other artificial languages. BCP 47 similarly has the subtag art, which together with the subtag x can be used to create a suitable private use tag for any constructed language that has not been assigned an official language tag (e.g., art-x-solresol could be used for Solresol, or art-x-Latino-sine-flexione for Latino sine flexione).
Note that the old SIL language identifiers (usually written in capitals) are officially obsoleted and should no longer be used. SIL International now uses ISO 639-3 language codes (and is acting as the Registration Authority for maintaining and publishing its associated registry) including in its most recent release of The Ethnologue report. The old SIL codes are no longer supported and will no longer be updated.
The IANA Language Subtag Registry (for IETF’s language tags defined in BCP 47) has also been updated on 29 July 2009 to include all ISO 639-3 and ISO 639-5 identifiers for individual languages, macro-languages and language collections (only those that were valid at this time, excluding those that were just drafted and still not approved, as well as those that were already retired or those with a pending retirement which was still not immediately applicable).
Read more about Codes For Constructed Languages: List of Codes
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