The -l just lists ports that are in the act of listening, whereas active connections are listed separately. For instance, if you have another computer on your home network (B), ssh from B to A. Then on A, list all the TCP connections with a netstat -at. The listening ports (including ssh) will show a foreign address of as above, and listed separately below in the active connections you'll see your ssh connection from B to A.
OK, but a potential connection (i.e. listenting) from Local address 0.0.0.0:[arbitrary port number] to foreign address 0.0.0.0:[arbitrary port number] represents a possible connection between what IP's?
So far, I have to assume that it is either any IP or no IP.
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