---
title: rzoneNumberMSB
framework: IOKit
role: symbol
role_heading: Instance Property
platforms: [Mac Catalyst 13.0+, macOS 10.2+]
path: iokit/dvdrzoneinfo/1394236-rzonenumbermsb
---

# rzoneNumberMSB

## Declaration

```occ
UInt8 rzoneNumberMSB;
```