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Dns.GetHostEntry Method (IPAddress)

Resolves an IP address to an IPHostEntry instance.

Namespace:  System.Net
Assembly:  System (in System.dll)
public static IPHostEntry GetHostEntry(
	IPAddress address
)

Parameters

address
Type: System.Net.IPAddress
An IP address.

Return Value

Type: System.Net.IPHostEntry
An IPHostEntry instance that contains address information about the host specified in address.
ExceptionCondition
ArgumentNullException

address is null.

SocketException

An error is encountered when resolving address.

ArgumentException

address is an invalid IP address.

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

IPv6 addresses are filtered from the results of the GetHostEntry method if the local computer does not have IPv6 installed. As a result, it is possible to get back an empty IPHostEntry instance if only IPv6 results where available for the address parameter.

The Aliases property of the IPHostEntry instance returned is not populated by this method and will always be empty.

NoteNote

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);
    }
}


.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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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