All subdomains are protected by Wildcard certificates instead of the asterisk. Wildcard is used to secure third-level subdomains. For example, the certificate for *.zonat.com secures the subdomains mail.zonat.com, autodiscovery.zonat.com and others. The Wildcard certificate issued for a third-level domain *.zonat.com also protects the second level base domain zonat.com However, this does not apply to asterisks on a lower-level domain (*.something.zonat.com does not secure something.zonat.com).