How to see all TCP connections being routed for hotspot? I want to see a list of all active TCP connections on my Android device, regardless of whether they terminate in the device. 

E.g., when my phone is serving as a WiFi hotspot, I would like to see all connections that the phone is routing between the WiFi and mobile networks.

netstat doesn't show these routed connections.

My device is rooted.
You can use netstat -tcp and that will show you all open TCP connections.

EDIT

Per your comment, you can use busybox (a very handy app you can download from the Play store) and then you can run:  busybox netstat -nat to show what you need.  

-Reference: linuxquestions