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How does IDNA encoding?

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How does IDNA encoding?

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As an example of how IDNA encoding works, suppose the domain to be encoded is Bücher.ch. This has two labels, Bücher and ch. The second label is pure ASCII, and so is left unchanged. The first label is processed by Nameprep to give bücher, and then by Punycode to give bcher-kva, and then has xn-- prepended to give xn--bcher-kva. The final domain suitable for use with the DNS is therefore xn--bcher-kva.ch.

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