You dont have to worry about him coming back with more IP's.
You can not just change your IP. You have to have your internet provider to do it. The only way you can do it yourself is by masking it, and you dont need a list of IPs to do this, you just use a random sequence of numbers. It is annoying to mask your IP. That is also something he dont know how to do since he said something having plenty of IPs.
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