How to program a domain searcher?

You'll want to work with the WHOIS protocol for domain lookups. With it you'll be able to find out if a domain is taken or not. There's a WHOIS web service that can help you get started.

Yes, unlike what was accepted, this is the only correct answer. – bortzmeyer Jun 14 '10 at 8:01.

You can do this by doing a DNS lookup and fetch the not found result. Example in nslookup. Nslookup bullocksarefree.com Server: 8.8.8.8 Address: 8.8.8.8#53 ** server can't find bullocksarefree.com: NXDOMAIN So, if your programming language supports networking, you can find it inside the DNS implementation.

No, bad algorithm. In several TLD, (.COM, . FR, etc), a domain can be registered and not published in the DNS ("on hold" in .

COM, "blocked" or "reserved" in . FR, etc). – bortzmeyer Jun 14 '10 at 8:00.

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