Abstract: The present invention is a system and method for managing the IP address space allocation of an ISP to reduce the probability that a subscriber's physical location can be discovered based on its IP address. In particular, the present invention is a system and method operable to detect and manage the IP address space allocation of an ISP that is taking part in an advertising system over a communications medium. The system and method of the present invention may incorporate or otherwise be operable to achieve any of the following: isolating individual member IP address statistics as part of an advertising system; finding individual and logical target groups that achieve a level of demand and popularity among the advertising system; and implementing embodiments of mechanisms to dynamically modify the IP address allocation of one or a plurality of such members within the ISP address allocation system.