While the name is less than inspired, ParkingWhoIs is a useful tool for finding out parking providers for domains. This beta site does a search of forty domain monetization programs to find the provider. Using it is as simple as typing in a domain name into the search bar and pressing the check button. If you don't know, domain parking is an advertising practice which monetizes incoming traffic by sending visitors to a page with ad links and listings. Some sites, e.g. those under construction, or coming soon, may choose domain parking as a placeholder of another website—businesses can use the parked page to direct traffic to an affiliate site. For instance, a site may be called abcd.com, but they may also own abcd.org, and xyz.com, which will all point back to abcd.com in order to attract more type-in traffic. So, with ParkingWhoIs, you'll be able to easily ferret out the real owner.