Sometimes you will see an IP Address that looks something like this: 2605:e000:9b20:e201:7c04:88a3:9a51:7051
And most of the time, you will see an IP Address that looks like this: 18.104.22.168
So whats up with the first one? Why does it not look like a normal IP Address? Thats an IPv6 IP Address.
Estimates on wikipedia say that only about 1% of internet traffic uses IPv6 Addresses. When you see that kind of address, don't be alarmed, that's normal and will happen from time to time. The only bad thing about it, is that iTracker *might* not be able to figure out the city/state/country/zip code by using it.
iTracker currently uses MaxMind for it's IP to Location lookup service. From our research, this service proved to be the most accurate service on the web. Maxmind is on top of the IPv6 stuff and as soon as it becomes more widespread, they will be implementing wider support for those type of addresses.