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X509AlternativeNamesEnum Enumeration

Contains alternative name enumeration used by Subject Alternative Names extension.

Namespace:  System.Security.Cryptography.X509Certificates
Assembly:  PKI.Core (in PKI.Core.dll) Version: (
public enum X509AlternativeNamesEnum
  Member nameValueDescription
Unknown0 The name type is not identified.
OtherName1 The name consists of an object identifier (OID) and a byte array that contains the name value.
Rfc822Name2 The name is an email address such as
DnsName3 The name is a Domain Name System (DNS) name such as The format of a DNS name is Host.Entity.Domain. For more information about DNS, see RFC 1034 (Domain Names—Concepts and Facilities), and RFC 1035 (Domain Names—Implementation and Specification).
DirectoryName5 The name is an X.500 directory name such as CN=administrators,CN=users,DC=corp,DC=company,DC=com.
URL7 The name is a URL such as
IpAddress8 The name is an Internet Protocol (IP) address in dotted decimal format 123.456.789.123.
RegisteredId9 The name is an object identifier (OID) registered with the International Standards Organization (ISO).
Guid10 The name is a Directory Service Agent GUID. The GUID identifies a server to the Active Directory replication system as a domain controller.
UserPrincipalName11 The name is a user principal name (UPN). A UPN is a user logon name in email address format. That is, a UPN consists of a shorthand name for a user account followed by the DNS name of the Active Directory tree in which the user object resides. It has the form UserName@DNS_suffix. An example is where is the DNS suffix and UserName is a placeholder for a shorthand name assigned by Microsoft to a user account.
See Also