How to find open ports on a computer

Clearapps network inventory
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How to find open ports on a computer

To find open ports on a computer, you can use netstat command line.

To display all open ports, open DOS command, type netstat and press Enter.
To list all listening ports, use netstat -an |find /i "listening" command.
To see what ports your computer actually communicates with, use netstat -an |find /i "established"
To find specified open port, use find switch. For example, to find if the port 3389 is open or not, do netstat -an |find /i "3389".
You can use PULIST from the Windows Resource Kit to find which process is using a specified port. For example, pulist |find /i "4125" may display

Process PID User
mad.exe 4125 Chicagotech/blin

Or you can use tasklist to find PID.

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