Computerized methods and systems determine LAP and UAP values of the MAC address of electronic devices. A memory stores LAP records. Each LAP record has at least: an LAP value associated with an electronic device, and candidate UAP values associated with the LAP value. A packet processor modifies the LAP records by updating the candidate UAP values based on information associated with packets received from electronic devices. A probing manager modifies each LAP record by updating each LAP record to include a determined UAP value selected from the candidate UAP values based on attempts to connect to an electronic device of the electronic devices using selected candidate LAP-UAP value pairs. Each pair has the LAP value of the LAP record and a selected one of the candidate UAP values that is selected based on one or more computed metrics associated with the candidate LAP-UAP value pairs.
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