Domain validated SSL Certificates are available in three types. DomainSSL to secure 1 (sub) domain. DomainSSL SAN to secure several (sub) domains including local host names. DomainSSL Wildcard to secure 1 domain and unlimited sub domains.
Secure 1 domain name, for example:
www.yourdomainname.com
yourdomainname.com
Secure several sub domain names, for example:
mail.yourdomain.nl
autodiscover.yourdomain.nl
exchange02.yourdomain.loc
exchange02
Secure all subdomains for your domain (*) for example:
*.yourdomainname.com