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How to Check Open TCP/IP Ports in Windows

<img src="http://www.howtogeek.com/geekers/up/sshot-2010-09-11-1-20-46-32.jpg" />Whenever an application wants to make itself accessible over the network, it claims a TCP/IP port, which means that port can’t be used by anything else. So if you need to use an in-use port, how do you tell what application is holding it?