Dns.GetHostEntry Method (IPAddress)

Note: This method is new in the .NET Framework version 2.0.

Resolves an IP address to an IPHostEntry instance.

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

public static IPHostEntry GetHostEntry (
	IPAddress address
public static IPHostEntry GetHostEntry (
	IPAddress address
public static function GetHostEntry (
	address : IPAddress
) : IPHostEntry



An IP address.

Return Value

An IPHostEntry instance that contains address information about the host specified in address.

Exception typeCondition


address is a null reference (Nothing in Visual Basic).


An error is encountered when resolving address.


address is an invalid IP address.

The GetHostEntry method queries a DNS server for the IP addresses and aliases associated with an IP address.


This member emits trace information when you enable network tracing in your application. For more information, see Network Tracing.

The following code example uses the GetHostEntry method to resolve an IP address to an IPHostEntry instance.

public static void DoGetHostEntry(string hostname)
    IPHostEntry host;

    host = Dns.GetHostEntry(hostname);

    Console.WriteLine("GetHostEntry({0}) returns:", hostname);

    foreach (IPAddress ip in host.AddressList)
        Console.WriteLine("    {0}", ip);

Windows 98, Windows 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

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

.NET Framework

Supported in: 2.0

.NET Compact Framework

Supported in: 2.0

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