16. The system of claim 13 , wherein the registrar-to-hosting-provider graph is a directed graph with the edges directed from the nodes representing the hosting providers to the nodes representing the registrars.
16. The system of claim 13 , wherein the registrar-to-hosting-provider graph is a directed graph with the edges directed from the nodes representing the hosting providers to the nodes representing the registrars. 17. The system of claim 16 , wherein the one or more edge attributes comprise: at least one from a group consisting of registrant information, name server information, expiration dates, registration dates, website traffic information, website type information, website language information, country information, and website content information.