Your phone constantly broadcasts probe requests looking for Wi-Fi networks it has connected to before, leaking your device's unique identifier and the names of networks you've visited—information that can be intercepted and used to track your location and movements. Even when you're not connected to Wi-Fi, these beacon signals create a passive trail of where you've been.
Every time your phone searches for a known Wi-Fi network, it broadcasts probe requests that contain your device MAC address and a list of networks you have previously joined, creating a passive location trail that does not require you to connect to anything. Retailers, airports, and surveillance systems capture these signals to map your physical movements over time.
AI tools can correlate probe request logs with other data sources to reconstruct detailed movement histories and infer home addresses, workplaces, and daily routines. Learning how probe requests work empowers you to configure your devices to randomize MAC addresses and limit the exposure of your network history to passive listeners.
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