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What is punycode?

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Punycode is a way to represent international domain names with the limited character set ('a'-'z', '0'-'9') supported by the domain name system. For example "münich" would be encoded as "mnich-kva".

An IDN takes the punycode encoding, and adds a 'xn--' in front of it. So "mü" would become "".

Related topics: International Domain Names (IDN)