# SCNetworkReachabilityCreateWithAddressPair(_:_:_:) Creates a reachability reference to the specified network address. ``` func SCNetworkReachabilityCreateWithAddressPair(_ allocator: CFAllocator?, _ localAddress: UnsafePointer?, _ remoteAddress: UnsafePointer?) -> SCNetworkReachability? ``` ## Parameters `allocator` The allocator to use. Pass `NULL` or to use the default allocator. `localAddress` The local address associated with a network connection. If `NULL`, only the remote address is of interest. The value of this parameter is copied into the new object. `remoteAddress` The remote address associated with a network connection. If `NULL`, only the local address is of interest. The value of this parameter is copied into the new object. ## Return Value A new immutable reachability reference. You must release the returned value. ## Discussion You can use the reachability reference returned by this function to monitor the reachability of the target host. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)