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How to get current listing of network ports in use?

As title mentions, how do I get a current listing of network ports on our network that are in use?  I remember doing this a few years back, but uncertain of the steps now.  I think it was from a command line and a dump to a txt file or similar?  Appreicate any feedback on the most efficient way of getting this completed.
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CICSA
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CICSA
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QlemoBatchelor, Developer and EE Topic AdvisorCommented:
The question is too broad for a complete answer. You can directly view which ports are in use on your machine at the moment, e.g. by running netstat -an in a cmd prompt. To see used ports in your network, you would either have to do that on all machines, or extract port and address info from a network capture (which is necessarily incomplete).
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Jan SpringerCommented:
If you are trying to determine ports that are open or open/filtered externally, use nmap.  You can scan an entire subnet.
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AlexBlinovCommented:
Do you use Cisco switches?
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Jan SpringerCommented:
I do.  I've been using them for many years.
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