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What are the “restricted characters” used by Punycode?

April 26, 2017punycode Used

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What are the “restricted characters” used by Punycode?

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Punycode uses only restricted ASCII characters and numbers (A-z, 0-9) and the hyphen (-). The Punycode schema and the standardization which specifies IDN wire-format to remain in the restricted ASCII repertoire was based on the following advantages: • Language independent • Superior in compression • Compact in code size • Round-trip safe • Superior for encoding Chinese/Japanese/Korean characters.