Whois Command in Linux

What is whois command in Linux?

Whois Command Usage and Options

whois command is a query and response protocol, used to fetch the contact details, creation and expiration date, address of the registered domains, websites and IP address.

By default , In Linux whois command format/syntax is,
whois [OPTION]... OBJECT...
In your terminal, type as whois and hit enter. This will automatically show the usage format and all the options of commands. It is shown in the below image.
Whois Command In Linux