Methods, systems, devices, and software are disclosed for providing controlled access to network characteristic data stored at a subscriber premises. In one embodiment, Internet services are provided to a subscriber through a subscriber's modem, connected to the Internet through an access network, and to a number of data terminals on a local network. The modem is adapted to receive and/or generate data from the connected networks and devices for use in generating network characteristic data. This data is stored in an access-controlled data storage module. Content providers may then login to the modem and query network characteristic data. The modem is configured to authenticate the content provider, and, if authorized and available, return the queried data to the content provider. The content provider may then communicate information to the subscriber's data terminal through the modem, according to the network characteristic data returned by the query.