I'm trying to build a simple python server that a client can connect to without the client having to know the exact portnumber. Is that even possible? The thought is to choose a random portnumber and using it for clients to connect. 
I know you could use bind(host, 0) to get a random port number and socket.getsockname()[1] within the server to get my portnumber. But how could my client get the portnumber?
I have tried socket.getnameinfo() but I don't think I understand how that method really works.
In order to do that the server must listen on a certain port(s).
This means the client(s) will need to interact on these ports with it.
So... no it is impossible to do that on some random unknown port.
How to give a python client a port number from a python server