21b4:0081 — DragonFly

AudioQuest

Vendor ID: 21b4
Product ID: 0081
Combined: 21b4:0081
Decimal: 8628:129

What is this device?

This is the USB identifier for a DragonFly manufactured by AudioQuest. The vendor ID 21b4 is registered to AudioQuest with the USB Implementers Forum, and 0081 is the product ID that AudioQuest assigned to this particular model. When you run lsusb on Linux, this device appears as 21b4:0081 AudioQuest DragonFly.

How to identify it on your system

Linux

$ lsusb
Bus 001 Device 004: ID 21b4:0081 AudioQuest DragonFly

You can filter directly with lsusb -d 21b4:0081, or get the full descriptor dump with lsusb -v -d 21b4:0081. Kernel messages from dmesg show the same pair as idVendor=21b4, idProduct=0081.

Windows

In Device Manager, open the device, go to Details → Hardware Ids. This device reports:

USB\VID_21B4&PID_0081
USB\VID_21B4&PID_0081&REV_0100

From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_21B4&PID_0081"

macOS

$ system_profiler SPUSBDataType
    DragonFly:
      Product ID: 0x0081
      Vendor ID: 0x21b4  (AudioQuest)

Driver help

Having driver issues with this device? Most USB devices are handled by a generic class driver; if yours shows up as an unknown device, confirm the ID above first, then check the manufacturer's downloads page.

Raw usb.ids entry

The exact lines this page is generated from, in the upstream source file:

21b4  AudioQuest
	0081  DragonFly