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+from: https://linuxize.com/post/check-listening-ports-linux/
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+
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+Check Listening Ports with netstat
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+netstat is a command-line tool that can provide information about network connections.
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+
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+To list all TCP or UDP ports that are being listened on, including the services using the ports and the socket status use the following command:
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+
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+sudo netstat -tunlp
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+
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+The options used in this command have the following meaning:
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+
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+-t - Show TCP ports.
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+-u - Show UDP ports.
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+-n - Show numerical addresses instead of resolving hosts.
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+-l - Show only listening ports.
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+-p - Show the PID and name of the listener’s process. This information is shown only if you run the command as root or sudo user.
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