What is RayHunter? EFF's Privacy Tool Explained #shorts

Our Take

STS Technologies LLC put together a tight, no-nonsense explainer on RayHunter, the Electronic Frontier Foundation's open-source detector for IMSI catchers and rogue cell towers. It's a solid primer: RayHunter runs on cheap off-the-shelf hardware and flags the kind of suspicious cellular behavior that stingrays and fake base stations use to snoop on your phone. Credit to the creator for making a dense technical topic digestible in under a minute.

Why does this matter to us? Because RayHunter is part of the same surveillance landscape we track every day — just a different flavor of dragnet. Flock's ALPR network quietly logs where your car goes; IMSI catchers quietly log which phones were nearby. Different tech, same playbook: normalize constant monitoring of ordinary people who've done nothing wrong, then ask forgiveness later if it's abused. The fact that a nonprofit had to build a public detection tool because nobody else would tell you when you're being surveilled should tell you everything about the current incentive structure.

Tools like RayHunter are a good sign — communities building their own countermeasures instead of waiting for permission. If you want to see the physical side of this surveillance buildout in your own neighborhood, check out our camera map, and if you're ready to push back locally, our take-action resources have concrete next steps.