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IPGlobalProperties.GetActiveUdpListeners Method

Returns information about the Internet Protocol version 4 (IPv4) and IPv6 User Datagram Protocol (UDP) listeners on the local computer.

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

public abstract IPEndPoint[] GetActiveUdpListeners()

Return Value

Type: System.Net.IPEndPoint[]
An IPEndPoint array that contains objects that describe the UDP listeners, or an empty array if no UDP listeners are detected.


The call to the Win32 function GetUdpTable failed.

UDP is a connectionless transport layer protocol that is responsible for sending and receiving datagrams. It is defined in IETF RFC 768.

A UDP listener is an open socket that waits for and receives UDP datagrams. Because UDP is a connectionless protocol, the listener does not maintain a connection to a remote endpoint.

The following example displays the active UDP listeners.

public static void ShowActiveUdpListeners()
    Console.WriteLine("Active UDP Listeners");
    IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
    IPEndPoint[] endPoints =  properties.GetActiveUdpListeners();
    foreach (IPEndPoint e in endPoints)

.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.