Can a Wildcard SSL secure 1st & 2nd level subdomains?

The subdomains that you can secure with one Wildcard SSL Certificate have to be either 1st level sub-domains (e.g.: *.example.com) or 2nd level sub-domains (*.mob.example.com). You cannot secure 1st and 2nd level sub-domains with one regular Wildcard SSL Certificate.

If you want to secure 1st level sub-domains and 2nd level sub-domains, you have to get a Multi-Domain Wildcard SSL Certificate, or 2 separate Wildcard SSL Certificates.

For example, a regular Wildcard SSL Certificate allows you to secure:

1. One main domain name (example.com) and all its 1st level sub-domains (*.example.com):
   1. my.example.com
   2. test.example.com
   3. dev.example.com
   4. mail.example.com
   5. (etc)
2. Or, one sub-domain (mob.example.com) and all 2nd level sub-domains (*.mob.example.com):
   1. my.mob.example.com
   2. test.mob.example.com
   3. dev.mob.example.com
   4. mail.mob.example.com
   5. (etc)

In order to secure one domain and all its sub-domains as shown in the first example, you have to include *.example.com as a common name (domain name) when creating a CSR (Certificate Signing Request). If you want to secure 2nd level sub-domains, then you have to enter *.mob.example.com as a common name (domain name) when creating a CSR (Certificate Signing Request).