Hey, my ISP provides me with a dynamic IP, like most people i assume, and this IP appears to change roughly every 3 day. Wouldn't this mean that any IP bad against you couldn't last more than 3 days? 😕
Yes and no. 😀
If the site bans your single IP, then once your IP changes, you can get back in. However, if you keep getting banned, eventually the site will ban the entire block.
If they ban like this:
220.127.116.11 - banned then your IP changes and you get 18.104.22.168 and it gets banned and your IP changes to 22.214.171.124 and it gets banned, eventually, they'll just ban 123.123.123.* or 123.123.*.* depending on the IPs assigned to the users ISP.