A system for generating a database containing the internal locations (e.g., floor, compass direction, room number, nearest fixed landmark, etc.) of fixed wireless devices within a building. To collect data for the database, a report-provider traverses a building with a mobile reporting device. As the provider traverses the building, the mobile reporting device directs the reports-provider to detected wireless devices (e.g., WiFi access points, Bluetooth beacons, Internet-connected appliances, etc.) and instructs the provider to enter information regarding the internal location of each device. When a walk-thru of a building is complete, the mobile reporting device generates a building report that contains the building's location and the internal locations of the detected wireless device. Multiple such reports may be combined by the system to generate the database of internal locations of wireless devices in various buildings.