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ISO 639-1

ISO 639-1:2002, Codes for the representation of names of languages—Part 1: Alpha-2 code, is the first part of the ISO 639 series of international standards for language codes. Part 1 covers the registration of "set 1" two-letter codes. There are 183 two-letter codes registered as of June 2021. The registered codes cover the world's major languages.

History
ISO 639, the original standard for language codes, was approved in 1967. It was designed to represent major and primary national languages with well-established terminologies and lexicography. In 1998 the standard was extended with an additional part, ISO 639-2, providing three-letter codes for a much wider range of languages. The original standard was redesignated as ISO 639-1 in 2002, in an updated version. == Updates ==
Updates
New ISO 639-1 codes are not added if an ISO 639-2 "set 2" three-letter code exists, so systems that use ISO 639-1 and 639-2 codes, with 639-1 codes preferred, do not have to change existing codes. If an ISO 639-2 code that covers a group of languages is used, it might be overridden for some specific languages by a new ISO 639-1 code. Part 3 (2007) of the standard, ISO 639-3, aiming to cover all known natural languages, largely supersedes the ISO 639-2 three-letter code standard. There is no specification on treatment of macrolanguages, which are covered by ISO 639-3. == IETF language tags ==
IETF language tags
The use of ISO 639 language codes was encouraged by the introduction of IETF language tags via RFC 1766 in March 1995. The current version of the specification is RFC 5646 from September 2009. ==See also==
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