Wildcard certificates secure an unlimited number of sub-domains under the main domain.
For example a wildcard certificate issued to *.servertastic.com would secure sub.servertastic.com
As a bonus it will also secure servertastic.com*
Wildcard certificates are ideal if you want to secure multiple sub-domains under a single certificate. Many also support unlimited servers. We provide both DV and OV wildcard certificates. (EV wildcards are not currently available).
When ordering a wildcard certificate the CSR generated should be for *.example.com