I got the same thing. I have 3 computers in my home and every time I log in from a different computer, there's a message that shows my previous and current IP. I'm not worried though cause so far nothing bad has really happened. All my accounts are still functioning properly (even better now with previous records cleared). I botted a lot like almost 24/7. Unless you're doing something really shady, there's no reason to be concerned. Nexon so far seems ok with minor hacking. I think they are after the big fish like in Korea. The ones that bot and sell billions of gold a day.