With a wildcard certificate from SSL.com, you can set up as many subdomains of your domain name as you want, and they’ll all be secured by a single SSL certificate. For example, a wildcard certificate issued for *.ssl.com would cover multiple subdomains like www.ssl.com, info.ssl.com and lookoutforthatfallingpiano.ssl.com. A wildcard will not, however, cover the 'naked' core domain. For example, *.ssl.com will not protect ssl.com, and *.www.ssl.com will not protect www.ssl.com. However, Wildcard SSL certificates from SSL.com automatically include the base domain name as a subject alternative name (SAN) entry, so this will also be covered by the certificate. For the rules covering exactly how a wildcard certificate can and cannot be used, please refer to this FAQ. This will cover any number of subdomains that may fall under your domain. You just set up your Wildcard certificate, and you’re good to go.