How many domain names does a certificate secure?

Certificates will only secure one domain name, and depending on the type of cert you obtain, it will be valid for only one hostname beneath that domain name. (ie: only and not

Wildcard certificates are valid for an unlimited amount of hostnames beneath a single domain name. With Wildcard certificates, the computers using,, as well as any other host based on domain will all be able to use the same certificate.

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