Uri.CheckHostName Method

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Determines whether the specified host name is a valid DNS name.

Namespace: System
Assembly: System (in System.dll)


Public Shared Function CheckHostName ( _
    name As String _
) As UriHostNameType
public static UriHostNameType CheckHostName(
    string name


  • name
    Type: System..::.String
    The host name to validate. This can be an IPv4 or IPv6 address or an Internet host name.

Return Value

Type: System..::.UriHostNameType
A UriHostNameType that indicates the type of the host name. If the type of the host name cannot be determined or if the host name is nullNothingnullptra null reference (Nothing in Visual Basic) or a zero-length string, this method returns Unknown.


The CheckHostName method checks that the host name provided meets the requirements for a valid Internet host name. It does not, however, perform a host-name lookup to verify the existence of the host.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0

See Also


Uri Class

System Namespace