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 March 2020.

ISO 639-2 and ISO 639-5 also have the code art for other artificial languages.[1] The BCP 47 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).

The old SIL language identifiers (usually written in capitals) are officially obsolete and should no longer be used. They formed the basis of the ISO 639-3 language codes, but some SIL identifiers that had been retired before the establishment of ISO 639-3 were later assigned to different languages within ISO.

The IANA Language Subtag Registry (for IETF’s language tags defined in BCP 47) was updated on 29 July 2009 to include all ISO 639-3 and ISO 639-5 identifiers in use at that time.

List of codes
Language ISO
639-1[2][3]		ISO
639-2[2][3]		ISO
639-3[3]		 BCP 47[4] MultiTree[5] SIL
Afrihili afhafh afh afh
Arcaicam Esperantom eo-arkaika
Balaibalan  zba zba
Blissymbols zblzbl zbl zbl
Brithenig bzt bzt bzt
Dutton Speedwords dws dws dws
Enochian i-enochian[note 1]
Esperanto eoepoepo eo epo ESP
Europanto eur[note 2][6] eur[7] EUR
Ido ioidoido io ido[8]
Interglossa igs igs igs
Interlingua (IALA) iainaina ia ina INR
Interlingue (former Occidental) ieileile
occ[note 3][9]		 ie ile
Klingon tlhtlh tlh
i-klingon[note 1]		 tlh
Kotava avk avk avk
Láadan ldn ldn ldn
Latino sine flexione la-peano
Lingua Franca Nova lfn lfn lfn
Lojban jbojbo jbo
art-lojban[note 1]		 jbo
Medefaidrin dmf dmf 1eo
Na'vi 08n
Neo neu neu neu
Novial nov nov nov
Quenya qya qya qya
Romanova rmv rmv rmv
Sindarin sjn sjn sjn
Talossan tzl tzl tzl
Volapük vovolvol vo vol

See also

Notes
  1. The BCP 47 language tags i-enochian, i-klingonand art-lojban are old tags that were grandfathered in. The last two are deprecated in preference to the later three-letter codes.
  2. The ISO 639-3 standard previously included the code eur for Europanto, which was retired on 2009-01-16, with the reason “Nonexistent”.
  3. ISO 639-3 used to have the code occ for Occidental. This was retired on 18 July 2007, because Occidental is just another name for Interlingue, which has the code ile.

References
  1. "639 Identifier Documentation: art". Sil.org. 2019-02-03.
  2. "Codes for the Representation of Names of Languages". Library of Congress. 2013-01-11.
  3. "ISO 639 code tables: constructed". Sil.org. Retrieved 2019-02-03.
  4. "IANA Language Subtag Registry". 2020-12-18.
  5. "Constructed Languages". MultiTree. 2019-02-03.
  6. "639 Identifier Documentation: eur". Sil.org. 2019-02-03.
  7. "Europanto". MultiTree.
  8. "Ido". MultiTree.
  9. "639 Identifier Documentation: occ". Sil.org. 2019-02-03.
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