---
title: bInterfaceSubClass
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.0+]
path: iokit/iousbfindinterfacerequest/1426057-binterfacesubclass
---

# bInterfaceSubClass

## Declaration

```occ
UInt16 bInterfaceSubClass;
```