: Why can't I use two hyphens in positions 3 and 4 of a domain name? I've come across a rule, that as far as I can tell, all domain registrars share: That you cannot register a domain that
I've come across a rule, that as far as I can tell, all domain registrars share: That you cannot register a domain that has two hyphens in positions 3 and 4 of the desired domain name. Apart from that, you can put as many hyphens in your domain as you like.
Is there an explanation for this rule?
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I suspect it's something to do with Punycode - the way of encoding Unicode characters into ASCII for domain names. However I don't understand the Punycode algorithm, so I can't see if allowing xx-- would somehow break the algorithm.
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