https://basics.domains/presentations/14/domain-name-basics/internationalized-domain-names-idn
Internationalized Domain Names (IDN) | Domain Name Basics
Domain Name Basics - Internationalized Domain Names (IDN) is a short introduction, meant to be an overview and training material for newcomers.
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https://www.rfc-editor.org/rfc/rfc3491.html
RFC 3491: Nameprep: A Stringprep Profile for Internationalized Domain Names (IDN)
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