Since I've got some experience in this area, because I'm currently still i.p banned.
And i've been playing for a week or so now. without using a I.P changer.
So i'll just cut to the chase and spit the info ya all might want to know.
There's several reasons why Nexon might I.P ban a person.
1) Your I.P has accessed accounts that usually logs from another I.P
2) You have too many goddam accounts, Yes that counts, cause Nexon fails. But you'll have a higher chance if all of your accounts' ID and PW are about the same.
3)You have been banned for so many times, either hacking, screaming ur lungs at other people. that nexon has to i.p ban ya.
Yea, reason 2) might surprise ya all, i was when i found this piece of info too.
1)Use a I.P changer, or change ur i.p address. I believe there's a guide somewhere i saw before on this forum, so just search around
2)This solution will address to reason 2). You need a few things, 1)a trusted buddy from another ISP or Teamview.
Ask ur buddy to help you change the password for your account, when it's done, DON'T USE WEB LOGIN. I REPEAT, DON'T USE WEB LOGIN Don't even think of typing rubbish in the web login. not even a legit id and pw. why? because if u do, nexon will direct u to a page saying ur acc have been deactivated blah, and ultimately, ask u to change ur friggin password. So everything is a cycle if you use web login.
my advice is use the combat arms direct, found in ur combat arms folder. create a shortcut to ur desktop for convenience if you want.
For teamview method, you can either ask a helpful minion or a trusted member of this site to help u. For choobs, teamview is a program where u can control other's computer. So when u control his/her computer, just change ur pw and ur done. the good part about this is that guy wont know wad's ur pw, he'll be sitting infront of the com and watching u type circles. the bad part is, if u trust a hacker, he'll most prolly have keylogger and steal your pw, by then, u'll be in a deep pot of shit.
Also, please note that this method might not work for everyone, i suggest that u keep changing ur i.p address until it doesnt work and u can try this step. Because everyone's ISP is different, when you get i.p banned, it has to do with ur ISP or something ( I FORGOT! D: )
I believe im done for now, if there's anything you guys might want to add, post it here and ima edit this.