ActiveWhois

ActiveWhois is a network tool for the retrieving of information such as country, E-mail and postal addresses for the owners of IP addresses and Internet domains. Technology in Active Whois allows you to explore DNS aliases, and will display the domain and IP address information together. You can investigate any Web site including international top level domains, and retrieve its ownership details and the location of the servers hosting the site with a click.

ActiveWhois accesses information located in approximately 100+ WHOIS servers worldwide. It is able to dynamically determine the correct server based on replies from other WHOIS servers. A "WHOIS-hyperlink" feature allows you to browse a domain's databases.

ActiveWhois will also work in offline mode. All of your completed WHOIS requests will be saved to disk to be accessible even without an Internet connection.

ActiveWhois provides links to domain registrars in each country.

Other features include: support for themes (you can customize the look by creating your own theme); and a NetStat feature that allows you to see who is connected to your computer.