---
title: GetInterfaceSubClass
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 18.4+, macOS 10.14+]
path: iokit/iousbinterfaceinterface942/2977221-getinterfacesubclass
---

# GetInterfaceSubClass

## Declaration

```occ
IOReturn (*GetInterfaceSubClass)(void *self, UInt8 *intfSubClass);
```