I stalk the Tech Support forums every now and then and didn't see you post over there.
But anyways, yes you are IP banned if you can only not connect to some realms. And from the sounds of it looks like you got an extended IP ban (lasts exactly 2 weeks). With very few exceptions, this is caused by trying to connect with an illegal CD-key (one that is Keygenned, torrented, or purchased through a 3rd party site).
The only other type of restriction is the temporary one that lasts up to 12 hours, but since this is your first time logging back into the game in a while, it's doubtful. If you still can't connect after 12 hours, then it's confirmation of the extended ban.
If you make a new topic over in the Tech forums, a blue (probably MartyT) will tell you exactly how long is left on your ban.
Q u o t e: But yeah if what OP is saying is true andf he did do nothing. then thats balls
The system is automatic, if you are IP banned, then you (or someone sharing your IP) did SOMETHING to cause it.