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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: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

.NET for Windows Store apps

Supported in: Windows 8

.NET for Windows Phone apps

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

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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