1. A computing system for determining whether a website is an illegitimate website, the system comprising: a requester module executed by the processing unit configured to request one or more rules from a host server for a website and to receive a response from the host server in response to the request; an analysis module executed by the processing unit configured to determine whether a response or lack of a response received by the requester module indicates that the website is an illegitimate website; and a record module executed by the processing unit configured to store an indication that the website is an illegitimate website, wherein the one or more rules provide one or more instructions to a robot computer program regarding access of the website by the robot computer program.