OID value: 2.5.29.18
OID description:
id-ce-issuerAltName
This extension contains one or more alternative names, using any of a variety of name forms, for the certificate or CRL issuer.
This extension may, at the option of the certificate issuer, be either critical or non-critical. An implementation which supports this extension is not required to be able to process all name forms. If the extension is flagged critical, at least one of the name forms that is present shall be recognized and processed, otherwise the certificate shall be considered invalid.
issuerAltName EXTENSION ::= { SYNTAX GeneralNames IDENTIFIED BY id-ce-issuerAltName }
See also the OID Repository website reference for 2.5.29.18