Explanation:

Whois information means that you can discover when and and by whom a domain name was registered.
If no privacy is used there are additional data containing the full name, address, phone number and email address of the owner.
Also fields for a domain administrator, technical administrator and other contacts might be found here.
You also get some data on the network mapped to a numerical IP address.

The format of the whois information may change on the different TLDs.