---
title: SCNetworkReachabilityCallBack
framework: systemconfiguration
role: symbol
role_heading: Type Alias
path: systemconfiguration/scnetworkreachabilitycallback
---

# SCNetworkReachabilityCallBack

Type of callback function used when the reachability of a network address or name changes.

## Declaration

```swift
typealias SCNetworkReachabilityCallBack = (SCNetworkReachability, SCNetworkReachabilityFlags, UnsafeMutableRawPointer?) -> Void
```

## Parameters

- `target`: The network target being monitored for changes.
- `flags`: The flags representing the reachability status of the network address or name (see doc://com.apple.systemconfiguration/documentation/SystemConfiguration/SCNetworkReachabilityFlags for information about these flags).
- `info`: A C pointer to a user-specified block of data.