You can't magically change your IP address. If you are lucky enough to have an ISP that gives you a dynamic IP address, there is no guarantee that a release/renew or flush of your connection will net you a new IP address. My old ISP would only give me a new one if I left the modem itself off for at least 10 minutes, any other restart or request for a new ip address gave the same one back.
And even then a decent subnet ban would probably cover all that you need to cover. My current ISP always gives me N.M.P.X where N,M, and P are constants and X has a range of only about 15 or so. [But I would never complain about my ISP, since it's the fastest cheap dedicated connection around.]
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