IDN - (Internationalized Domain Names - Internationalized Domain Names) are domain names that contain symbols of national alphabets.
Due to technical limitations, domain names cannot contain non-Latin characters, so special standards have been developed to get around this limitation.RFC 3490, RFC 3491, RFC 3492andRFC 3454, according to which such names are necessarily converted into a set of English letters, numbers and hyphens, and a special prefix "xn--" is written before such a converted name. This conversion is called Punycode. It allows you to encode names in national alphabets with ASCII characters.
The conversion process is handled by the client's browser. Therefore, entering into the browser line "example.test" and "xn - e1afmkfd.xn - 80akhbyknj4f" are the same for modern browsers (only the second option will work for old ones). Only the second option is stored in the databases of DNS servers. In fact, internationalized domain names are aliases for names starting with "xn--".
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