Subject Alternative Name (SAN)
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def
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an extension to an X.509 Digital Certificate listing additional identification information, allowing a single certificate to support many different domains
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example
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a single certificate for a large organization can list many specific subdomains and services (regional sites, ad services, a video platform, etc.) under its subject alternative names, so one certificate covers all of them
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distinguish from
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Wildcard Certificate — which covers an entire pattern of subdomains (e.g.,
*.example.com) rather than an explicit list of named domains
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