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IPGlobalProperties.GetActiveTcpConnections Method

Returns information about the Internet Protocol version 4 (IPv4) and IPv6 Transmission Control Protocol (TCP) connections on the local computer.

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

public abstract TcpConnectionInformation[] GetActiveTcpConnections()

Return Value

Type: System.Net.NetworkInformation.TcpConnectionInformation[]
A TcpConnectionInformation array that contains objects that describe the active TCP connections, or an empty array if no active TCP connections are detected.


The Win32 function GetTcpTable failed.

The objects returned by this method include connections in all TCP states except the Listen state. You can check the state of a connection by calling State.

The TCP protocol is defined in IETF RFC 793. Note that the objects returned by this method reflect the connections as of the time the array is created. This information is not updated dynamically.

The following example displays endpoint information for active TCP connections.

public static void ShowActiveTcpConnections()
           Console.WriteLine("Active TCP Connections");
           IPGlobalProperties properties = IPGlobalProperties.GetIPGlobalProperties();
           TcpConnectionInformation[] connections = properties.GetActiveTcpConnections(); 
           foreach (TcpConnectionInformation c in connections)
               Console.WriteLine("{0} <==> {1}", 

.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.