Here are two tools to look up the registrant information of certain domain URL.
1. WHOIS database provided by GoDaddy
The WHOIS database is a searchable list of every single domain currently registered in the world. To find out who owns a particular domain name, all you have to do is type it into the box above. The Internet Corporation of Assigned Names and Numbers (ICANN) requires accredited registrars like GoDaddy.com to publish the registrant’s contact information, domain creation and expiration dates and other information in the WHOIS listing as soon as a domain is registered.
For example, “godaddy.com” was registered by “Go Daddy Operating Company, LLC” whose phone number is +1.4805058844
This tool will list all DNS records for a domain.