The data might be coming from the .com/.net/.org zonefiles, where a domain will ... | Hacker News

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aseidl on June 13, 2014 | parent | context | favorite | on: Domain name search with regular expressions and cu...

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.

ohashi on June 14, 2014 [–]

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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