CheckHostName Method

Uri.CheckHostName Method (String)


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

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

public static UriHostNameType CheckHostName(
	string 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 null 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.

The following example checks whether the host name is valid.


Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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