Whois may refer to any of the following:
1. A command used on some chat networks, such as IRC, that enables a user to find out additional information about users; such as their hostname, IP address, channels, and how long they have been online. For example, if the username was mrhope you could type the command below to display information about that person.
4. With Windows Sysinternals, Whois is a utility to view who owns an Internet address.