Looking to make a RAT, but how can I make it without ports?

Alright, so hear me out.
I can make a RAT with a free program, like Nanocore (Which sucks, I know), but the problem is, how do I get an open port to do so? I have an open port with my ISP, but I hear I can get in trouble for ratting with it, so is there a way to do this without using a paid for VPN? I know VPNs have open ports, but I don’t wanna pay for one.

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