Techniques are described for automatically determining which of a plurality of target devices should be connected with a source device using data regarding ambient signals about the source device. For example, a request is received for an identifier to which a source device is to connect. Data is received describing at least one ambient signal detected by the source device. The data is compared with a plurality of target device profiles. It is determined that the data matches a target device profile of the plurality of device profiles. An identifier associated with the determined target device profile is returned.