Whomium

Click the blue "i" action button on the right of the address bar to view a log of all HTTP requests created by the current tab. IP addresses, domain names, AS numbers, AS names and network names will be displayed.

None of the information collected by this extension is transmitted over the network, nor stored on disk. All whois lookups are performed against a local database included with the extension.

Note: whois information is not always accurate. For more information see the license file included with the extension.