Abstract: A system comprising a system computer, a source portable storage device (PSD), and a remote PSD. The system computer has a computer-readable medium comprising a set of instructions for receiving the address of the source device and a group identifier; storing reported addresses and group identifiers; receiving a query from a remote device comprising the address of the remote device and a group ID; communicating a matching source IP address, if any, to the remote device; communicating the remote address of the remote device, if any, to the corresponding source device. The source PSD has a group identifier, and comprises a set of computer-executable instructions for reporting the address and group identifier of the connected source device to the system computer. The remote PSD comprises a set of instructions for querying the system computer for a source IP address corresponding to the group identifier.