In January 2016, the latest SSL certificate from GeoTrust Certification Authority was released. GeoTrust QuickSSL Premium Wildcard with domain validation is an alternative to such a market veteran as RapidSSL Wildcard SSL. The new product is provided with SHA-256 encryption algorithm and unlimited server licenses.
You can protect the main domain name, as well as an unlimited number of subdomains. The certificate can be reissued for free and as many times as needed, but changing the domain name is not allowed. Comodo certificates do not have such limitations, and the domain name can be changed.