Patent ID: 8392550

Claim:
A content delivery system comprising: an analyzer module; a content request data collection module that at least: receives a content request sent to a tracking address; collects content request information about the content request; and provides the content request information to the analyzer module; and a hardware domain name server that at least: receives a first address request from a first local domain name server associated with a first autonomous system for a cache server address; provides an internet protocol address for the cache server in response to receiving the first address request; receives a second address request from a second local domain name server associated with a second autonomous system for the cache server address; provides the tracking address to the second local domain name server in response to receiving the second address request, wherein providing the tracking address to the second local domain name server is based upon the second local domain name server being associated with the second autonomous system; collects address request information about the first address request and the second address request; and provides the address request information to the analyzer module; wherein the analyzer module that at least: receives the address request information and the content request information; and determines information about clients served by the first and second autonomous systems based on the address request information and the content request information.