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I like the idea but the source whois data seems quite inaccurate.

It said that digit.com and 6af.com were both free (which I obviously jumped on) but turns out they are actually registered and not due to expire for some time.

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I understand that's annoying, and hope to improve it. The system reports digit.com free because it doesn't have an A record, but I will fix this by checking SOA records in the future. I'm not sure why 6af.com is reported free, maybe there was a temporary DNS problem when I checked it. It should be updated in a couple of days.

You could first try the ANY query (which won't return all records though) and then a whois query on failed ones to be sure. Combined with some smart caching and affiliate/click tracking (to see if a new domain gets registered).

Why are you doing DNS queries to determine if something is free? You can find registrars with APIs you can ping and check availability.

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