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A DNS label is an individual component of a DNS name.
A LDH (Letters, Digits, Hyphen) label, which is the classical label form.
A DNS label which contains more than just letters, digits and a hyphen.
A reserved LDH label (R-LDH label), which have the property that they contain "--" in the third and fourth characters.
A label that begins with "xn--" and follows the LDH rule.
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A DNS label is an individual component of a DNS name.
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A DNS label is an individual component of a DNS name.