Systems and methods are disclosed according to the implementations of the present disclosure for determining whether a cable modem has been placed in an unauthorized location. One system, among others, comprises a first cable modem and a second cable modem. The first cable modem is configured to transfer data between a first subscriber device and a headend facility and is intended to be used in a first residence. The second cable modem is configured to transfer data between a second subscriber device and the headend facility and is also intended to be used in the first residence. The first cable modem sends first information, corresponding to at least one parameter of the first cable modem, to the second cable modem. The second cable modem compares the first information with second information corresponding to at least one parameter associated with the second cable modem.