WhoIs is a command-line utility that permits you to search and analyze a domain record for any IP address.This utility should be run with administrator priveledges and can be used simply by entering a domain name (like MajorGeeks.com) or via the IP address of your target search. Once your search is entered, WhoIs will provide you with a number of details including phone numbers, fax numbers, physical address, etc. You can use the -v switch to print out the data if you desire.