A WhoIs lookup is part of any site owners Domain Stategy. Whois Services are offered by many sites that allow the purchase of Domains. I buy my Domains from Godaddy (maybe I will blog about why I hate on netsol, but latter for that), but I do all my lookups on www.whois.sc. There interface is easy, and they have very nice reverse lookup*.
*Reverse lookup becomes important when you are sending out alot of mail. In order to stay off of the SPAM blacklists and get on ISP whitelists you will need to have the reverse lookup of the IP your are sending out your mail on reverse lookup back to your base domain(the domain that is sending out the email)
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