Use an asterisk (*) wildcard to indicate one or multiple variable
subdomains. For example, to specify enforcement for Palo Alto Network’s
website regardless of the domain extension used, which might be
one or two subdomains depending on location, you would add the entry:
*.paloaltonetworks.com
.
This entry would match to both docs.paloaltonetworks.com and support.paloaltonetworks.com.