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Uri.CheckHostName Method

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

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

public static UriHostNameType CheckHostName(
	string name
)

Parameters

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.

Console.WriteLine(Uri.CheckHostName("www.contoso.com"));
   

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

.NET for Windows Phone apps

Supported in: Windows Phone 8.1, Windows Phone Silverlight 8.1, Windows Phone Silverlight 8

Portable Class Library

Supported in: Portable Class Library
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