1. A proxy server comprising: a processor; and a computer-readable storage medium having instructions that, when executed by the processor, cause the processor to: determine that each of multiple wireless devices is associated with a predetermined vicinity; determine respective identification information corresponding to each of the wireless devices; associate the respective identification information corresponding to the wireless devices to a dummy identification in response to determining that each of the wireless devices is associated with the predetermined vicinity; receive a request, from a requester, relating to the predetermined vicinity, wherein the requester is distinct from the wireless devices; and send the dummy identification to the requester in response to receiving the request and determining that the wireless devices are associated with the predetermined vicinity.