How to Check a Hotel Room or Airbnb for Hidden Cameras

The fastest way to check a room is a Dowse sweep: three passes over the room in about 90 seconds, covering the Wi-Fi, the Bluetooth around you, the lens-glint and infrared checks, and a guided walk through the eight places cameras actually get hidden. It ends with one report and a plain verdict. Your first sweep is free.

Below is what each of those passes is doing and why, so you know what the result means rather than trusting a green tick.

The 90-second sweep, step by step

1. Start the sweep. Open Dowse and start a Check-In Sweep. It runs three passes over the room, Wi-Fi then Bluetooth then a guided look around, and takes about 90 seconds.
2. Let the Wi-Fi pass probe the network. Every device on the network is probed and anything behaving like a camera is flagged, from video-stream ports to known camera hostnames. You can open a suspect's own web page straight from the report.
3. Let the Bluetooth pass name what is broadcasting. Dowse lists what is transmitting around you and flags trackers and beacons, naming devices from the official Bluetooth registry rather than leaving you with raw codes.
4. Run the Lens Check and Night Vision Check. Your torch strobes while the camera watches for the pinpoint flash a lens reflects back. Then, with the lights off, your camera becomes an infrared scope, because night-vision cameras flood a dark room with light your eyes cannot see.
5. Walk the Sightlines checklist. Dowse guides you through the eight places cameras are actually hidden, one at a time, so nothing gets skipped at midnight in an unfamiliar room.
6. Read the Room Report. One plain verdict, either nothing stood out, worth a look, or needs attention, plus a list of anything the sweep could not check. The report is saved to your trip log.

The Wi-Fi pass: probing, not just listing

A camera that streams has to be on the network, and devices on a network can be interrogated. Most free tools stop at listing what is connected. Dowse probes each device and scores it, looking for the ports video devices answer on, most commonly 554 and 8554 for RTSP, along with hostnames that give the game away outright.

When something looks wrong, you can open that device's own web page directly from the report and see what it calls itself. That is usually the moment a question becomes an answer.

One thing worth knowing, because it changes how you read the result. Most hotel networks run client isolation, which hides every guest device from every other one. On those networks a scan returns nothing no matter what is in the room. Dowse marks that as a blocked check rather than a clean one, so an empty network is never rendered as a safe room.

The Lens Check and Night Vision Check

Every lens reflects light straight back toward its source, the same reason animal eyes flash in a photograph. Dowse's Lens Check strobes your torch while the camera watches for that pinpoint return, and it keeps the frame so you can see exactly what answered rather than taking its word for it.

The Night Vision Check handles the dark. Cameras that record at night need infrared light and produce it themselves, invisible to you and plainly visible to your phone sensor. Prove it in four seconds: point a TV remote at your phone camera and press any button, and the bulb that looks dead flares white-purple on screen. Dowse turns that same sensor into a scope with a reticle so you can sweep a dark room properly instead of squinting at a viewfinder.

Sightlines: the eight places, walked one at a time

Real cases cluster hard. A camera has to be powered, has to have a view, and has to look like it belongs, which narrows it to roughly eight objects:

• Smoke detectors, especially one on a wall rather than a ceiling, or a second one in a room that already has one.
• Alarm clocks pointed at the bed rather than readable from it.
• USB chargers and plug adapters plugged in with nothing attached.
• Air vents with anything visible behind the slats.
• Picture frames and mirrors, particularly a frame hung lower than eye level.
• Televisions, around the bezel and beside the standby light.
• Power strips sitting on furniture instead of the floor.
• Plants, books and tissue boxes with a clear line to the bed.

This is the pass most detector apps skip, because it cannot be faked and it cannot be automated. Dowse walks you through all eight in order and records which ones you actually checked. At midnight in an unfamiliar room, being handed the next item beats trying to remember a list you read on a blog once.

Why the physical pass is the one that matters

A camera that records to a memory card and never joins a network transmits nothing at all. No radio signal, no network traffic, no Bluetooth. Nothing electronic can find that one, and no app on any phone can either.

Which is exactly why Sightlines exists and why Dowse is built around it. The apps that promise a scan and stop there are selling you the half of the problem that is easy to automate. The torch, the reticle and the eight-item walk cover the half that actually catches devices.

What a Dowse sweep leaves you with

Every sweep ends in a Room Report carrying one of three verdicts: nothing stood out, worth a look, or needs attention. Most sweeps land on the first, and that is the point. Beneath it sits a list of anything the sweep could not check, including blocked permissions and networks that hide guests from each other.

Reports are kept in a trip log, so you build a record of where you have stayed and what each place came back as. They live on your phone and in your own iCloud. Nothing is sent to us, and your movement history never leaves the device.

If you actually find something

Leave it exactly where it is. Do not unplug it, cover it, or take it apart. Photograph it in position, including a wide shot showing what it was pointing at, then take your belongings and leave before you make any calls.

Call the local police first, then the booking platform once you have a report number. Airbnb and Booking.com both treat undisclosed recording devices as grounds for immediate removal, and they move faster with an official record attached. Moving the device destroys the one piece of evidence that establishes where it was aimed.

Related

If your concern is something following you rather than watching a room, see how to tell if an AirTag is tracking you. If you have simply lost something of your own, see how to find lost Bluetooth headphones.

Common questions