Port Viewer Software
TCPView is a Windows program that will show you detailed listings of all TCP and UDP endpoints on your system, including the local and remote addresses and state of TCP connections. On Windows NT, 2000 and XP TCPView also reports the name of the process that owns the endpoint.
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Active Ports - easy to use tool for Windows NT/2000/XP that enables you to monitor all open TCP and UDP ports on the local computer.
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Netstat Viewer is a handy GUI replacement for the command line application "netstat".
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