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threaded port scanner - not terminating

I've tailored the threaded port scanner as a module in a program I'm using. I'm calling the module from my main program.

The issue I have is that the threads never seem to terminate. So if I run a port scan on a whole /24 network a couple of times, it eventually dies because it can't start any new threads.

I've added:

        for thread in threading.enumerate():
           print(thread.name)

I can see them add up and never start over at "thread 1".

Can anyone help me understand how to fix this?