The netstat command is a Command Prompt command that you can use to dig up all sorts of very interesting things about the individual connections your computer is making to other computers - both over the Internet and on your own network.
One of the coolest netstat tricks is netstat -o. Running netstat this way will show you all the active connections at that moment, plus show you the process identifier (PID) for each of those connections. You can then use Task Manager to track down the program with the corresponding PID, matching the open connection to a specific program on your computer.
This can be extremely handy when trying to track down a piece of malware, figure out where a keylogger is sending your information to, or determine which of your programs is hogging your bandwidth.
See Netstat Command Details & Examples for more on netstat -o and everything else you can do with this handy little networking command.
Netstat is available in all versions of Windows - Windows 7, Windows Vista, Windows XP, the Server operating systems, and even Windows 98!.
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