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What Is SAN?

SAN — an X.509 certificate extension that lists the DNS names, IP addresses, or other identities covered by the certificate.

In public key infrastructure, trust runs from the site certificate through intermediate certificates to a trusted root CA. A certificate binds a name to a public key, while the corresponding private key must remain under the service owner’s control.

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Popular Questions About SAN

  • What does SAN mean?

    SAN — an X.509 certificate extension that lists the DNS names, IP addresses, or other identities covered by the certificate.

  • What role does it play in HTTPS?

    The component participates in certificate issuance, validation, revocation, or automated renewal and helps a client authenticate the server before protected data exchange.

  • What should be checked?

    Verify domain-name coverage, validity dates, the complete chain, key algorithm, revocation status, and private-key storage on trusted systems only. Automate renewal and expiration monitoring.

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