Embodiments provide systems, methods, and computer program products for inferring the switch port connectivity of discovered but unmanaged devices in a network without direct access to the devices. Embodiments operate by generating a physical address-to-port map based on collected operational data and then pruning the generated map based on switch port connectivity information and/or inferred link connectivity information. The switch port connectivity of discovered unmanaged devices is then generated or updated based on the pruned map. The switch port connectivity information can be used by various other tools to enable diagramming, asset inventory, and network planning, design, and optimization workflows.