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01-Dec-2020 18:40

Is there a quick and dirty way to validate if the correct FQDN has been entered? ASCII labels either follow the old syntax, or begin "xn--", in which case they are a punycode version of a Unicode string. Keep in mind there is no DNS server or Internet connection, so validation has to be done via regex/awk/sed. It's harder nowadays, with internationalized domain names and several thousand (! The easy part is that you can still split the components on ".". There's a site for that: only need to check the ICANN-recognized ones. The rules for Unicode are very complex, and are given in RFC5890. As it requires making ICU a dependency of PHP, I’ll publish a PHP RFC on this topic soon!At the beginning of 2014 ICANN (the governing body for top level domain names) enforced a new process for validating domain name contact details.Each label is 1 to 63 characters long, and may contain: Any binary string whatever can be used as the label of any resource record. Implementations of the DNS protocols must not place any restrictions on the labels that can be used.

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It works on Unix but still lacks a Windows build system.In particular, DNS servers must not refuse to serve a zone because it contains labels that might not be acceptable to some DNS client programs.https://

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