A system (20) is designed for identifying devices (1, 2, . . . ) which are arranged for detecting a sensory identifier and transmitting request messages comprising representations of the detected sensory identifier. The system comprises at least one correlation relation server (e.g. 5C) for correlating representations received from the devices (1, 2) so as to match two or more of those devices, preferably when the devices (1, 2) are in each other's proximity. The system further comprises at least one proxy server (e.g. 8X) for routing a request message from a device (1, 2) to at least one correlation server (e.g. 5C), the routing being dependent on said representations or other information contained in the request messages.