IPNetInfo from NirSoft is a small utility that allows you to easily find all available information about an IP address: The owner of the IP address, the country/state name, IP addresses range, contact information (address, phone, fax, and email), and more. This Whois Lookup tool can be particularly helpful when trying to find information about domains or IPs when troubleshooting SPAM, Security issues. Even helpful when trying to troubleshoot your own Domain, IP problems.
How does it work ?
The IP address information is retrieved by sending a request to the whois server of ARIN. If ARIN doesn't maintain the information about the requested IP address, a second request is sent to the whois server of RIPE, APNIC, LACNIC or AfriNIC. After the IP address information is retrieved, IPNetInfo analyzes the Whois record and displays it in a table. Notice: From time to time, the WHOIS server of ARIN is down and doesn't respond to WHOIS requests from IPNetInfo, and thus IPNetinfo fails to retrieve the IP address. When such a thing occurs, simply try again later. This tool can run on Windows 98/ME/2000/XP/2003 and can run from the command line. For more information and download the latest version, please click here