In Windows, how do I see all listening network ports?

One of the most revealing signs of a system compromise is new open or listening ports. Therefore, you should be aware of the open ports on your computer. Viewing open ports can help you determine if your computer has been compromised.

In Windows, you can use the netstat.exe program to view all listening network ports. To do so, from a command prompt, type netstat . You can use also use options to get more information, as in the following examples:

You can also combine options, e.g., netstat -oan .

For more, see Microsoft Help and Support article 281336.

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