---
title: mask
framework: avrouting
role: symbol
role_heading: Instance Property
path: avrouting/avcustomroutingpartialip/mask
---

# mask

A mask that represents how many octets of the IP address to respect.

## Declaration

```swift
var mask: Data { get }
```

## See Also

### Inspecting the IP fragment

- [address](avrouting/avcustomroutingpartialip/address.md)