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What is currently used is https://tools.ietf.org/html/rfc952,It disallowed labels from starting with a digit or with a hyphen character, and could not end with a hyphen. so,A hostname like '123.sogou.com' is judged to be illegal
What is currently used is https://tools.ietf.org/html/rfc952,It disallowed labels from starting with a digit or with a hyphen character, and could not end with a hyphen. so,A hostname like '123.sogou.com' is judged to be illegal
https://tools.ietf.org/html/rfc1123 permitted hostname labels to start with digits.
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