Examples:
www.mydomain.com
subdomain.domain.com
domain.com
Use * wildcard to match any subdomain or domain.
For example:
shop.*.*
for your shop subdomain
blog.mydomain.*
to match blog on all tld's
*.mydomain.*
to match all subdomains and tld.
Use
*.*.*
to match all other hosts.
Must be unique for each site.