Wildcards for blocking or allowing subdomains

When entering a URL restriction or exception, you do not need to use a wildcard to block or allow all of the associated sub-domains. 

For example, when you enter "site.com", it will automatically include all sub-domains, such as xyz.site.com, zzz.site.com, etc.

Blocking a subdomain "play.google.com" will not block the primary domain "google.com"