The Whois database is a central database providing searchable list with information of every single domain that is currently registered in the world. According to ICANN regulations, every domain must have valid information. That means that anyone can see contact details of a domain owner. If you want to avoid spammers, you can order ID protection service that masks the contact details of a domain owner.
The following contact information should be provided: domain names’ registrant, administrator, technical, and billing contact information. Among these, the registrant is the owner of the domain.
For more information and checking who owns a domain, read our detailed post.
