Short answer: You certainly can! There is certainly no technical reason wildcard domains can’t be incorporated into UCC certificates, and it is often the case that a wildcard domain in a UCC is not only the easiest solution, but the most affordable. In fact, it’s the only solution if you want multiple wildcards in a single SSL certificate. SSL.com’s Multi-domain UCC can secure multiple sites and multiple subdomains, using fully qualified domain names, wildcard domains and more. To cover unlimited subdomains, just create the wildcard domains (i.e. *.sitename.com) in the common name field or as a SAN (Subject Alternative Name) when you purchase your UCC. You can even put other wildcards in the SAN fields such as *.sub1.sitename.com, *.sub2.sitename.com, *.another.com, etc. You cannot however, put multiple wildcard levels such as *.*. SSL.com will charge you just $129 per year to add your wildcard SSL to your UCC.