The DigiCert Wildcard SSL certificate will secure not only your entire domain but also an unlimited number of first-level subdomains. All this can be done with a single and flexible certificate!
These certificates are most preferred by organizations who manage multiple websites hosted across many subdomains. With this certificate you can issue as many copies of certificates as you want on any number of domains. Each of these certificates will be assigned their own private key. So, protect additional domains by adding Wildcard SANs at any point during the certificate lifecycle.
The DigiCert certificates are not only compatible with all the major browsers and mobile devices but come along with award-winning customer support services.