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You can do whois queries yourself.
It's been a long time but I think if you send a telnet connection to a whois server (port 43 me thinks) then send it the base domain name it'll return a response. Regardless of the port it would be similar to connecting to an apache server through fsockopen on PHP to get the HTTP headers of a page.
Check on sourceforge...I'm 99% positive there's been a PHP based whois solution built there...if not, I know perl has one on CPAN...that is of course unless you feel like doing the work yourself =)
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