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A comment on Domain name search with regular expressions and curated sets. Parent comment

Re:Domain name search with regular expressions and curated sets by aseidl on Friday June 13, 2014 @11:31AM (#7889317)
The data might be coming from the .com/.net/.org zonefiles, where a domain will only show up if it has an NS record configured.

I'm not sure if there's a free and authoritative source for registered domains, short of grep'ing zonefiles and checking whois.

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Re:Domain name search with regular expressions and curated sets by ohashi on Friday June 13, 2014 @11:56PM (#7892025)
There's no other way to bulk lookup quickly besides zone files. Maybe if you are a registrar and even that I am not sure of (depending on how many results you need).
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