WHOIS Lookup gives you the ability to look up any generic domain name. This will display all of the details associated with the site as well as the technical contact which includes your domain registrar.
Before you can use, simply install the whois package
root@test-VirtualBox:/# apt-get install whois
Here is a simple text below, this will output information off google.
root@test-VirtualBox:/# whois google.de