IDN
Internationalized Domain Name: a domain that contains non-ASCII characters, encoded via Punycode for DNS transport.
An IDN (Internationalized Domain Name) is a domain that uses characters outside the original ASCII letter-digit-hyphen set, such as `münchen.de`, `日本.jp`, or `إختبار.مصر`. Because DNS itself is ASCII-only, IDNs are encoded to Punycode for transport (`xn--mnchen-3ya.de`) under the IDNA standard. Browsers and email clients display the Unicode form to users where it is safe to do so, falling back to the punycode form when label-mixing rules indicate possible homograph attacks. DNS Checker displays both forms side by side: `.닷넷 (.xn--t60b56a)`.