Systems, methods, and computer program products are provided for identifying affiliated domains. A method includes identifying a plurality of domains, where each domain is associated with a particular hostname and each domain includes one or more resources, identifying a set of one or more linked domains, designating one or more domains within the set of linked domains as being affiliated with the first domain, and storing the domain affiliation information. Linked domains are domains from the plurality of domains that are linked to the first domain, and a second domain is linked to the first domain if one of the first or the second domains includes resources containing navigation links to resources of the other domain.