Back to the original problem PsyClown. I had the same thing when I installed ZoneAlarm and I pinged the relevant ip address with the "-a" name to find out the domain (if any) and discovered that there were different IP's attempting to connect.
I eventually deduced that these IP addresses were ABSA ISP servers checking to see if I was still connected(I'm on an ABSA dial-up connection :-/).
So, after this long story, I think that IP address notification of yours may be your ISP checking if your public IP is still up and running.
Now that I think about it, it makes sense, since ISP's use dynamic IPs which are dynamically assigned when you connect to them. So the servers automatically check to see if your IP is still up periodically.
Or it could just be a haxxor.