Glad you like it! The domain name list is provided in an 8GB dump from Verisign. You sign up to get access, but the process isn't too bad. There are around 1

Glad you like it! The domain name list is provided in an 8GB dump from Verisign. You sign up to get access, but the process isn't too bad. There are around 100 million registered .com domains right now. Building the bloom filter takes about 20 minutes. It would be smart to double check with Whois data, but that would slow the process down. Right now I link to the registrars instead since they will do the Whois verification. I'd definitely consider open sourcing or collaborating on the code. Send me a note.