Querying the domain registration information
After you know the target domain name, the first thing you would want to do is query the Whois database about that domain to look for the domain registration information. The Whois database will give information about the DNS server and the contact information of a domain.
WHOIS is a protocol for searching Internet registrations, databases for registered domain names, IPs, and autonomous systems. This protocol is specified in RFC 3912 (https://www.ietf.org/rfc/rfc3912.txt).
By default, Kali Linux already comes with a whois client. To find out the Whois information for a domain, just type the following command:
# whois example.com
The following is the abridged result of the Whois information:
Whois Server ...
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