This documentation is archived and is not being maintained.

IPGlobalProperties.GetActiveUdpListeners Method

Returns information about the Internet Protocol version 4 (IPv4) 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)
void ShowActiveUdpListeners()
    Console::WriteLine(S"Active UDP Listeners");
    IPGlobalProperties* properties = IPGlobalProperties::GetIPGlobalProperties();
    IPEndPoint* endPoints[] =  properties->GetActiveUdpListeners();
    System::Collections::IEnumerator* myEnum8 = endPoints->GetEnumerator();
    while (myEnum8->MoveNext())
        IPEndPoint* e = __try_cast<IPEndPoint*>(myEnum8->Current);

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0