SmartWhois is a useful network information utility that allows to find out all the available information about an IP address or a hostname, including country, state or province, city, and name of the network provider. Unlike standard Whois utilities, SmartWhois can find the information about a computer located in any part of the world, intelligently querying the right database and delivering all the related records within a few seconds. Even if an IP address cannot be resolved to a hostname, it's not a problem for SmartWhois.

Impressive. This is an easy-to-use tool that works well. It can handle a very large number of lookups. I passed it a list of several thousand IP addresses this morning, and it plowed through them without any problem. It can export the results to excel as well. This is a very useful tool.

Source: download.com