.NET Framework Class Library
Dns.GetHostEntry Method (String)

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

Resolves a host name or IP address to an IPHostEntry instance.

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

Syntax

Visual Basic (Declaration)
Public Shared Function GetHostEntry ( _
    hostNameOrAddress As String _
) As IPHostEntry
Visual Basic (Usage)
Dim hostNameOrAddress As String
Dim returnValue As IPHostEntry

returnValue = Dns.GetHostEntry(hostNameOrAddress)
C#
public static IPHostEntry GetHostEntry (
    string hostNameOrAddress
)
C++
public:
static IPHostEntry^ GetHostEntry (
    String^ hostNameOrAddress
)
J#
public static IPHostEntry GetHostEntry (
    String hostNameOrAddress
)
JScript
public static function GetHostEntry (
    hostNameOrAddress : String
) : IPHostEntry

Parameters

hostNameOrAddress

The host name or IP address to resolve.

Return Value

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

Exception typeCondition

ArgumentNullException

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

ArgumentOutOfRangeException

The length of hostNameOrAddress is greater than 126 characters.

SocketException

An error is encountered when resolving hostNameOrAddress.

ArgumentException

hostNameOrAddress is an invalid IP address.

Remarks

The GetHostEntry method queries a DNS server for the IP address that is associated with a host name or IP address.

When an empty string is passed as the host name, this method returns the IPv4 addresses of the local host.

NoteNote

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

Example

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

C#
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 Security

Platforms

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.

Version Information

.NET Framework

Supported in: 2.0

.NET Compact Framework

Supported in: 2.0
See Also

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Community Content

F. Chapleau
Timeout on GetHostEntry

If you want to have this method wrapped, with timeout and default on DNS exceptions, check this out.

http://www.chapleau.info/cs/blogs/fchapleau/archive/2008/09/09/reverse-dns-lookup-with-timeout-in-c.aspx

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