Start with the name it broadcasts
Almost every Bluetooth Low Energy device announces a name, and that name is usually the model number. LE_WH-1000XM4 is a pair of Sony headphones. JBL Flip 6 is a speaker. Something ending in TV is a television. A scan that shows you these names resolves the large majority of “unknown device” questions in about ten seconds.
What you cannot rely on is the name always being there. Devices designed for privacy, including Apple hardware and modern trackers, rotate their identifiers deliberately, so they appear as an anonymous string that changes over time. An anonymous identifier is not by itself suspicious; your own iPhone does the same thing.
Rule out the obvious sources
Bluetooth Low Energy carries through walls, floors and ceilings. In a flat you are routinely picking up several neighbours. Before assuming anything, account for: televisions and soundbars, smart bulbs and plugs, doorbells and cameras, cars in the street or car park, laptops and tablets on standby, fitness equipment, and every pair of headphones in the building.
A useful test is time of day. Devices that appear in the evening and disappear in the morning belong to a household, not to you.
The question that actually matters: does it follow you?
A device that is present in your flat and absent everywhere else is a neighbour’s. A device that is present at home, then at the supermarket, then at work, is travelling with you, and that is the pattern worth attention.
Scan in at least two locations that are far apart, and compare. Any identifier that appears in both is either something you own, something someone with you owns, or something attached to you or your vehicle.
If a device is following you
Take it seriously and do not handle it alone. An unknown tracker moving with you can indicate that someone is monitoring your location.
Do not confront anyone you suspect. Do not destroy the device, it may be evidence, and the serial number on an AirTag can be used by police to identify the account it is registered to.
Contact your local police. In the United States, the National Domestic Violence Hotline is available on 1-800-799-7233 and has specific guidance on tracking devices. In the UK, the National Domestic Abuse Helpline is 0808 2000 247. If you are in immediate danger, call your emergency number.
If you believe you are being tracked in the context of an abusive relationship, be aware that removing the device may itself be noticed. Advice from a specialist service before acting is worth more than any app.
Why your iPhone might not have warned you
iOS has built-in unknown tracker alerts, and they are good, but they are deliberately conservative. An alert generally requires that the tracker has been separated from its owner and has travelled with you for a period of time, which introduces a delay measured in hours, and coverage differs across tracker brands.
A scan shows you what is broadcasting right now, which is a different and more immediate question than the one the alert system answers.
More on identifying devices
The rest of the material on working out what is broadcasting around you.
- “Unknown Accessory Detected” on iPhone: what it means, iOS alerts
- How to check whether someone is tracking you, Safety
- How to scan a room for hidden Bluetooth devices, Method
- See battery on nearby devices, Inside Scan
- Beacon: A device that only broadcasts
- Bluetooth hub, the complete list
Common questions
What does an unknown Bluetooth device near me usually turn out to be?
In the overwhelming majority of cases, a neighbour’s television, soundbar, smart bulb, headphones or car. Bluetooth passes through walls easily, so in a flat or terraced house you are constantly seeing other households’ hardware.
Why do some devices show no name?
Privacy-conscious devices rotate their Bluetooth identifiers on a schedule so they cannot be tracked across locations. iPhones do this, and so do modern trackers. A nameless device is not automatically a threat.
How do I tell if a Bluetooth device is tracking me?
Scan in two locations that are a long way apart and compare. Anything that appears in both is travelling with you. A device that only appears at home belongs to your home or a neighbour.
Should I remove a tracker I find?
Not before you have thought about it. It may be evidence, and if it is linked to an abusive situation, removing it may be noticed. Contact the police, and speak to a domestic abuse service if that context applies.
In the app: The scan shows every nearby device with its name, battery and live signal strength. Read about Bluetooth Scanner.