Free tool
Find out which company hosts a site, the network in front of it, and who runs its DNS and email.
example.com
We can tell from its response headers and the name it points at.
A network in front of the site caches it closer to visitors and absorbs attacks.
Every check reads only what the site and its public DNS show. Nothing is signed in to, submitted, or attacked.
Enter the domain above. We look at the site's addresses and their names, the name it points at, its name servers, and the headers it answers with, and name the company they point to.
When a network like Cloudflare sits in front of a site, it answers for the site, so the real hosting company does not show from outside. That is normal and good for security. The site's owner can see the host in their DNS or hosting account.
Not always. The registrar is where the domain is registered; the host is where the site runs; the DNS provider points one at the other. They can be three different companies.