Recently, the FBI, DEA and even the Canadian Mounted Police have suggested that the switch to IPv6 is making it more difficult to track criminals online, those who would traffic in things such as drugs or child pornography, in addition to hackers, botnets, kidnappers and terrorists. Under IPv4, it wasn't very difficult to find offenders online via their IP addresses. The American Registry of Internet Numbers (ARIN) would hand out the address and internet providers would log them into the public WHOIS database. more