Subject Alternative Name

An example of an EV certificate on https://www.ssl.com (note the Subject Alternative Name field)

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. These values are called Subject Alternative Names (SANs). Names include:

• Email addresses
• IP addresses
• URIs
• DNS names (this is usually also provided as the Common Name RDN within the Subject field of the main certificate.)
• directory names (alternative Distinguished Names to that given in the Subject)
• other names, given as a General Name: a registered object identifier followed by a value

See also

• Wildcard certificate