USB class 0x09 — Hub
Class code 0x09 marks a device or interface as Hub. Operating systems read this value from the descriptor and bind a generic class driver, which is why most hub hardware works without a vendor driver even when the VID:PID pair is unrecognised.
How it appears on your system
$ lsusb -v
bInterfaceClass 9 HubWindows exposes the same value in the compatible IDs list as USB\Class_09, extended with &SubClass_xx&Prot_xx for the subclass and protocol below.
Subclass and protocol codes
| Subclass | Protocol | Meaning |
|---|---|---|
| 00 | — | Unused |
| 00 | 00 | Full speed (or root) hub |
| 00 | 01 | Single TT |
| 00 | 02 | TT per port |
Looking up a specific device instead? Search by VID:PID or browse the vendor directory.