USB class 0xfe — Application Specific Interface
Class code 0xfe marks a device or interface as Application Specific Interface. Operating systems read this value from the descriptor and bind a generic class driver, which is why most application specific interface hardware works without a vendor driver even when the VID:PID pair is unrecognised.
How it appears on your system
$ lsusb -v
bInterfaceClass 254 Application Specific InterfaceWindows exposes the same value in the compatible IDs list as USB\Class_FE, extended with &SubClass_xx&Prot_xx for the subclass and protocol below.
Subclass and protocol codes
| Subclass | Protocol | Meaning |
|---|---|---|
| 01 | — | Device Firmware Update |
| 02 | — | IRDA Bridge |
| 03 | — | Test and Measurement |
| 03 | 01 | TMC |
| 03 | 02 | USB488 |
Looking up a specific device instead? Search by VID:PID or browse the vendor directory.