Questions tagged [idn]

An internationalized domain name (IDN) is an Internet domain name that contains at least one label that is displayed in software applications, in whole or in part, in a language-specific script or alphabet, or the Latin alphabet-based characters with diacritics. These writing systems are encoded by computers in multi-byte Unicode. Internationalized domain names are stored in the Domain Name System as ASCII strings using Punycode transcription.

An internationalized domain name (IDN) is an Internet domain name that contains at least one label that is displayed in software applications, in whole or in part, in a language-specific script or alphabet, such as Arabic, Chinese, Cyrillic, Tamil, Hebrew or the Latin alphabet-based characters with diacritics, such as French. These writing systems are encoded by computers in multi-byte Unicode. Internationalized domain names are stored in the Domain Name System as ASCII strings using Punycode transcription.

(From Wikipedia.)

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ASCII symbols prohibited in Internationalized Domain Name (IDN)

Could you please provide a proof (e.g. and RFC section) that 7bit ASCII characters (like plain old ASCII space, code 0x20) that were previously illegal are still disallowed in IDNs?
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