TCPView is a free Sysinternals tool from Microsoft allowing you to monitor TCP and UDP endpoints. It has the same purpose as the command line tool netstat that comes with Windows. Contrary to netstat, TCPView is a GUI tool. Usually, it is the first tool I use if strange things are happening on a computer, i.e. if I think that it might have been infected by spyware or other malware.
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TCPView lists the process, the local TCP port, the remote address and the state of the TCP connection. If you want to get more details about the program, for example where the exe file is located, you just have to right click and select “Process Properties”. You can also terminate a connection or end the process.
There is a command line version of TCPView (Tcpvcon) which is similar to netstat. TCPView runs Windows Server 2008/Vista/NT/2000/XP and Windows 98/Me.