If you log onto your banned account you may go to your warning points and read about your ban and why it was issued to you. If there is no active infraction on your account, it must be your IP has been banned. Usually IP bans are only for more serious offenses however. So if you feel you did nothing wrong but still your IP address has been banned, it may be a mistake.
After looking into your account it seems it has been banned physically and purposefully, not by an IP ban.
If you feel your ban was unjust or a mistake you may appeal from it by clicking here.
Also, often if you are using a VPN or proxy of some sort to change your IP address, it may be changing your IP to one that has already been banned by a different member previously. So you may want to stick to your home IP while browsing the forums.