1. A distributed computer system implemented method comprising: extracting, by a computer system, identifiers from URLs, each of the identifiers identifying an entity associated with a URL from among the URLs; classifying the extracted identifiers of the URLs as parent identifiers and child identifiers; designating, by the computer system, a sequence of identifiers as attributable for a URL from among the URLs by: (1) determining whether any of one or more child identifiers of a parent identifier of the URLs account for more than a threshold percentage of traffic flowing from the computer system to an entity associated with the parent identifier, (2) responsive to a negative determination, designating a sequence of identifiers including the parent identifier as attributable, and (3) responsive to a positive determination, designating a sequence of identifiers including the one or more child identifiers as attributable; and attributing responsibility for each of the URLs to the entity associated with one of the designated attributable sequences of the URL.
15. The distributed computer system implemented method of claim 1 , wherein the attributable sequence is associated with a hosting provider.