[1] [[IDN]] に対し、[[ASCII文字]]のみの[[ドメイン名]]を[DFN[ASCII[RUBYB[ドメイン名]@en[domain name]]]]といいます。

* 関連

[2] [[国際化ラベル]]に対する[[ASCIIラベル]]と同じようなものです。

[FIG(quote)[
[FIGCAPTION[
[3] [CITE@en[RFC 7483 - JSON Responses for the Registration Data Access Protocol (RDAP)]]
([TIME[2017-05-07 17:28:01 +09:00]])
<https://tools.ietf.org/html/rfc7483#section-3>
]FIGCAPTION]

> 
>    LDH names:        Textual representations of DNS names where the
>                      labels of the domain are all "letters, digits,
>                      hyphen" labels as described by '''['''RFC5890''']'''.  Trailing
>                      periods are optional.

]FIG]