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I have a always reappearing bluetooth device on my iMac (macOS 11.5.2). It just shows as a MAC address and is not connected. This is the System Report output.

f3-8f-f4-57-45-c2:
  Address:  F3-8F-F4-57-45-C2
  Major Type:   Miscellaneous
  Minor Type:   Unknown
  Services: 
  Paired:   Yes
  Configured:   Yes
  Connected:    No
  Bluetooth Core Spec:  1.0b
  Class of Device:  0x00 0x00 0x0000

I already tried to remove the device, reset all connected Apple devices and reset the Bluetooth module. Nothing worked, the device always shows up after a few minutes.

I don't see this device on any other Apple device like my MacBook and iPad. So I don't think, it is not something iCloud or HomeKit related.

How can I identify what this device is and how can I remove it?

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  • No idea if/how this information will be helpful, but looking up the vendor for that MAC address reveals that it is not part of any registered OUI block. Therefore, if it is an actual physical device, the manufacturer has not properly registered it with IEEE. In other words, I'm unable to find any leads based on the info you gave me. Commented Aug 25, 2021 at 15:49
  • Would you mind running system_profiler SPBluetoothDataType in terminal and adding the full results to your post? Commented Aug 25, 2021 at 15:56
  • There ist nothing more, than what I posted about this device in System Profiler. I also checked the vendor ID and could not find anything. I suspect it is some "software device" related device Commented Aug 29, 2021 at 13:17
  • Does it appear if you are connected to a network/ have bluetooth disabled/ take your laptop ouf the region it is picking it up in? Commented Aug 30, 2021 at 13:12
  • It always appears. It is just a previously connected device, which is not connected. Commented Aug 31, 2021 at 7:12

1 Answer 1

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How much human-parseable information a Bluetooth device broadcasts is entirely up to the device's implementors, so there is no guarantee that you'll be able to find an easy answer. However, there are a couple of things you can do to heuristically make a guess.

  1. First, if the transmitter is a standalone device, you can try to find its approximate physical location in your room by running a realtime RSSI display tool (e.g., Bluetooth Inspector) and playing "warmer / colder" with your iMac: When RSSI goes up (becomes less negative) you know you're getting closer, and when it goes down (negative value increases) you are farther away. You will need a long extension cord and good upper arm strength to do this effectively.
  2. You can use Apple's PacketLogger, part of their Additional Tools for Xcode package at the Apple Developer downloads page, to filter for data packets coming from the MAC address you mentioned and inspect them. It is more than likely that the packets won't contain plaintext ASCII and so will probably not directly give away what this device is, but the combination of packet timing/intervals, packet length, data variance between packets, and other metadata might start giving you some clues on what this thing is. Truly trying this is going to require at least hour of patience and data manipulation.
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  • I also already tried it. The device will not connect and it not seems so send right ever. Commented Aug 29, 2021 at 13:19

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