forwarding target number?


my xubuntu web server is connected to a router for internet connection.

I can open the web page using at the moment.

In order to open the web page using real IP (for example:
I have to do port forwarding to the web-server.

In order to do port forwarding, I have to confirm the forwarding target number (for example,,, or ...)

How can I get the forwarding target number?
101, 102, ....... 150?
(192.168.10 is fixed).

On window, command "ipconfig" at DOS prompt can get it, but this is linux.
How can I check the forwarding target number on linux?

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