---
title: destinationSubnetMask
framework: networkextension
role: symbol
role_heading: Instance Property
path: networkextension/neipv4route/destinationsubnetmask
---

# destinationSubnetMask

The destination network mask of the route.

## Declaration

```swift
var destinationSubnetMask: String { get }
```

## Discussion

Discussion This string is combined with destinationAddress to specify the destination network of the route.

## See Also

### Accessing IPv4 Route Properties

- [destinationAddress](networkextension/neipv4route/destinationaddress.md)
- [gatewayAddress](networkextension/neipv4route/gatewayaddress.md)