SSL Multilevel Subdomain Wildcard

Question

I bought a wildcard certificate for *.example.com. Now, I have to secure *.subdomain.example.com. Is it possible to create a sub-certificate for my wildcard-certificate?

Answer 1

It is impossible to secure multi-level subdomains with a single wildcard certificate. If wildcard certificate issued for *.mydomain.tld, so it can secure only first-level subdomains of *.mydomain.com.

To secure your second-level subdomains, you have two choices.

Purchase another wildcard certificate for *.sub1.mydomain.tld. In that case, you need to manage two individual wildcard certificates.

You can go with a multi-domain wildcard certificate, where you can add up to 100 multiple domains or subdomains.

For example,

• *.mydomain.tld
• *.sub1.mydomain.tld
• *.sub2.mydomain.tld
• *.anydomain.com

It will secure your multiple domains and multi-level subdomains and reduce your hassle from multiple certificate management.