25dd:2311 — keyfour-a1
Bit4id Srl
- Vendor ID
- 25dd
- Product ID
- 2311
- Combined
- 25dd:2311
- Decimal
- 9693:8977
What is this device?
This is the USB identifier for a keyfour-a1 manufactured by Bit4id Srl. The vendor ID 25dd is registered to Bit4id Srl with the USB Implementers Forum, and 2311 is the product ID that Bit4id Srl assigned to this particular model. When you run lsusb on Linux, this device appears as 25dd:2311 Bit4id Srl keyfour-a1.
How to identify it on your system
Linux
$ lsusb Bus 001 Device 004: ID 25dd:2311 Bit4id Srl keyfour-a1
You can filter directly with lsusb -d 25dd:2311, or get the full descriptor dump with lsusb -v -d 25dd:2311. Kernel messages from dmesg show the same pair as idVendor=25dd, idProduct=2311.
Windows
In Device Manager, open the device, go to Details → Hardware Ids. This device reports:
USB\VID_25DD&PID_2311 USB\VID_25DD&PID_2311&REV_0100
From PowerShell: Get-PnpDevice | Where-Object InstanceId -match "VID_25DD&PID_2311"
macOS
$ system_profiler SPUSBDataType
keyfour-a1:
Product ID: 0x2311
Vendor ID: 0x25dd (Bit4id Srl)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:
25dd Bit4id Srl 2311 keyfour-a1