the most efficient way to do this yourself is a combination of DSN and WHOIS. first, do a DNS query for type ANY. if you get something back, go to the next domain. if you don't, then do a WHOIS query. that way, you are doing the minimal amount of WHOIS queries. you can also make the DNS and WHOIS portions separate processes, so that the WHOIS queries are throttled independently.

In reply to Re: Massive WHOIS queries? by robobunny
in thread Massive WHOIS queries? by BUU

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