UN M.49 in language tags & locales

Doug Ewell doug at ewellic.org
Mon Nov 9 19:36:16 CET 2015

Don Osborn wrote:

> Trying to catch up on what the current rules are on use of 3-digit
> region codes in language tags and got lost in the wording of RFC 5646.
> Also interested to know if these UN M.49 codes can still be used in
> locales.

The rules were set out in RFC 4645, Section 2.

In short, the code elements for macro-geographical regions are in; those
for individual countries (because they already have two-letter code
elements from ISO 3166-1) and for non-geographical categories like
"economic groupings" are out.

You can get an up-to-date list by looking in the Language Subtag
Registry [1]. The three-digit region subtags are listed immediately
after the two-letter ones.


Doug Ewell | http://ewellic.org | Thornton, CO 🇺🇸

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