IETF language tag

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File Format
Name IETF language tag
Ontology

An IETF language tag is a standard identifier for a human language or dialect. It is a short string of text; an example is "en-US".

A language tag consists of a sequence of hyphen-separated subtags, which define and refine the language.

Registration of subtags is handled by IANA. Language tags are no longer registered directly.

[TODO: What exactly is the relationship between this and ISO 639?]

Contents

Specifications

  • RFC 5646: Tags for Identifying Languages
  • RFC 4647: Matching of Language Tags
  • BCP 47: Tags for Identifying Languages

Obsolete RFCs

  • RFC 1766: Tags for the Identification of Languages
  • RFC 3066: Tags for the Identification of Languages
  • RFC 4646: Tags for Identifying Languages

See also

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