Language Subtags, Tag Extensions, and Tags

Last Updated

2025-04-02

Available Formats

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Registries Included Below

• Language Subtag Registry
• Language Tag Extensions
• Language Tags (OBSOLETE)

Language Subtag Registry

Registration Procedure(s)

Expert Review

Expert(s)

Doug Ewell

Reference

[RFC5645][RFC5646]

Note

Registration requests should be submitted to the 
[ietf-languages@ietf.org] mailing list. For more information, see 
[RFC5646, Section 3.5].
    

Note

The format of the registry is explained in Section 3 and Section 3.1
of [RFC5646].

When referring to language tags in specifications, please refer to 
[RFC5646].
    

Registry File

[https://www.iana.org/assignments/language-subtag-registry]
    

Supplemental Information

Language subtag registration forms are available in the [Language
Subtag Registration Form Archive.]
    

Language Tag Extensions

Registration Procedure(s)

IETF Review or IESG Approval

Reference

[RFC5646]

Note

While registration requires IESG approval or an IETF Stream RFC, the 
maintaining authority for an extension can submit changes to contact 
information and/or URLs directly to IANA, as described in [RFC5646, Section 5.2].
    

Registry File

[https://www.iana.org/assignments/language-tag-extensions-registry]
    

Language Tags (OBSOLETE)

Registration Procedure(s)

Registry closed

Reference

[RFC3066][RFC4646]

Note

This registry is obsolete and has been replaced by the [Language
Subtag Registry], as described in [RFC4646, Section 5.1].
    

Registry File

[https://www.iana.org/assignments/language-tags]
    

Supplemental Information

      
Language tag registration forms are available in the [Language Tag
Registration Form Archive].