IANA has registered or modified the following regional subtags:

003
021

IANA has registered the following script subtags:

Dupl
Elba
Sind

Please see

http://www.iana.org/assignments/language-subtag-registry

http://www.iana.org/assignments/lang-subtags-templates/index.html

Best regards,

Amanda Baber
Internet Assigned Numbers Authority
ICANN