Domain120: An Essential Domain Name Lookup Tool

Domain120 is an Ajax-based domain query tool that instantly displays information such as whether the domain has been registered or not as you input the domain name. It supports 20 kinds of top-level domains.

If the domain is not registered, Domain120 will list reference prices from several domain registrars; if it has been registered, it allows users to visit the site of the domain, or to check its Pagerank, Alexa ranking, and Whois information.