How to locate open and used ports

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Use command prompt command 'NETSTAT' to find the ports the system currently listening to and also to find out the ports the system has currently established.
c:>netstat -an |find /i "listening"
c:>netstat -an |find /i "established"
c:>netstat -an |find /i "listening" > c:\ports.txt Exports the results to file.