what? ARIN tracks all American IPs (thus the 'a') - but if you are a residential ISP, you also get your IPs from ARIN. But the point is that you can't go t

what? ARIN tracks all American IPs (thus the 'a') - but if you are a residential ISP, you also get your IPs from ARIN. But the point is that you can't go to ARIN if you want information about European IPs; RIPE is the equivalent European org. If an IP isn't allocated by a RIR, it is a "bogon" and usually dropped by your anti-spoof filters at your router.