Use wildcards in alternate domain names
When you add alternate domain names, you can use the * wildcard at the beginning of a domain name instead of adding subdomains individually. For example, with an alternate domain name of *.example.com, you can use any domain name that ends with example.com in your URLs, such as www.example.com, product-name.example.com, marketing.product-name.example.com, and so on. The path to the object is the same regardless of the domain name, for example:
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www.example.com/images/image.jpg
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product-name.example.com/images/image.jpg
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marketing.product-name.example.com/images/image.jpg
Follow these requirements for alternate domain names that include wildcards:
The alternate domain name must begin with an asterisk and a dot (*.).
You cannot use a wildcard to replace part of a subdomain name, like this: *domain.example.com.
You cannot replace a subdomain in the middle of a domain name, like this: subdomain.*.example.com.
All alternate domain names, including alternate domain names that use wildcards, must be covered by the subject alternative name (SAN) on the certificate.
A wildcard alternate domain name, such as *.example.com, can include another alternate domain name that’s in use, such as example.com.