DNS Tools :: Whois

WhoIs lookups provide information about the owner and registrar of a domain name or IP address. You can use this tool to find out where your domain is registered and what registration information about it is publicly available.

Note: Many registrars offer 'whois privacy'. Since spammers often harvest email addresses from whois data it can be well worth the additional cost to take advantage of this service (if it is available from the registrar of your domain.)