Subject Alternative Name

From Wikipedia, the free encyclopedia
(Redirected from SubjectAltName)
An example of a Subject Alternative Name section for domain names owned by the Wikimedia Foundation

Subject Alternative Name (SAN) is an extension to X.509 that allows various values to be associated with a security certificate using a subjectAltName field.[1] These values are called Subject Alternative Names (SANs). Names include:[2]

RFC 2818 (May 2000) specifies Subject Alternative Names as the preferred method of adding DNS names to certificates, deprecating the previous method of putting DNS names in the commonName field.[3] Google Chrome version 58 (March 2017) removed support for checking the commonName field at all, instead only looking at the SANs.[3]

See also[edit]


  1. ^ "x509v3_config - X509 V3 certificate extension configuration format". OpenSSL. Retrieved 2020-01-16.
  2. ^ RFC 5280: Subject Alternative Name
  3. ^ a b Medley, Joseph (March 2017). "Deprecations and Removals in Chrome 58". Google Developers. Retrieved 2022-01-04.