Do SSL certificates include sub domains as well?

Solution

In short, no they do not. The certificates are good only for what they were issued for. Such as www.domain.com, but not domain.com. There are situations where a cert would be good for a subdomain. This is called a wildcard cert.

The cert would be issued for *.domain.com, so that secure.domain.com, as well as subdomain.domain.com would work for the cert.

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