On 3 Jun 2025, at 14:32, Marco Davids (IETF IMAP) 
<[email protected]> wrote:
(oh the email address transformation magic)
> 
> Dear RDAP gurus,
> 
> I am struggling a bit with understanding how to represent the country in RDAP.
> 
> So far I found:
> 
> https://datatracker.ietf.org/doc/html/rfc6350#section-6.3.1
> (vCard Format Specification)

…which recommends structured text field and uses country name (not 2-letter ISO 
code.)
> 
> 'overruled'/extended by:
> 
> https://datatracker.ietf.org/doc/html/rfc8605#section-3
> (ICANN Extensions for RDAP)

which asks for CC=country-code but still uses full country name (USA) in 
examples.

my own opinion is that ISO code is better: less ambiguous (United States / USA 
/ US etc). the problem with that is some countries do not habe these codes 
(example: Kosovo.)

we also have some ISO 3166 codes which are not a country, for example EU, or 
*were* (like SU.)

> Then there is:
> https://datatracker.ietf.org/doc/html/rfc9083#name-common-data-types (JSON 
> Responses for RDAP) referring to 
> https://datatracker.ietf.org/doc/html/rfc8259 (The JSON Data Interchange 
> Format).
> 
> All suggesting to use the alpha-2 ISO-3166 country code abbreviation. This is 
> also what I see in the wild; no full country names.

For reference, our UA ccTLD service (https://ap.hostmaster.ua) returns country 
names, not codes,  so at least one exception exists.

> But it's not clear to me if the alpha-2 country code needs to be in the CC 
> parameter [RFC8605], or if it also allowed in the country name [RFC6350, 
> section 3] or perhaps it doesn't matter ?
> 
> I see both in the wild:
(…)

another thing’s to consider: using country code instead of country name, in 
some rare cases, may be considered better by its residents if their country 
code refers to colonial name (touchy.)

— dk@
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