Systems and methods for identifying fraudulent Internet traffic are provided. A tracking script is provided that generates a unique URL encoding an IP address of a client device. In order to find an IP address associated with the unique URL, a request for the IP address associated with the unique URL is received at a DNS resolver server from a DNS server upstream from the client device. The IP address of the client device, the DNS server upstream from the client device and the DNS resolver server in a database are correlated to obtain information about the Internet traffic to determine the likelihood that the traffic is fraudulently generated.