Query & Response Protocol that gives you registrant information for any domain or an IP block.

e.g.: Domain to buy: quitehacker.com

The Domain Registrant: GoDaddy.

This also applies to IP blocks or the owner of IP blocks which by now are pretty much owned by all the ISPs. "

GoDaddy will ask for my personal information to buy the quitehacker.com domain.

We can get all that information through whois.

GUI

CLI

whois quitehacker.com

DNSSEC

Protects the DNS information

whoisGuard

Protects the registrant information being leaked through whois

whois 74.125.68.106
whois quitehacker.com > -/Desktop/whois.txt