Blocking All Subdomains

When you manually block a domain, you automatically block all of its subdomains. For example, if you are blocking example.com, our policy engine will also block a.example.com, a.b.example.com.

If you only want to block a subdomain a.example.com, then instead of adding example.com to the list, you will add a.example.com. Note that once you add a.example.com to the block list, Cloudflare Gateway will also block all subdomains of a.example.com.