How can I determine the default gateway on iPhone?

Question

I need to obtain the IP address of the default gateway in an iPhone application. I cannot find the proper API. Anyone know if iPhone exposes this information?

Answer 1

On iOS ≥ 12, you can use the Network framework.

The NWPath you get from the NWPathMonitor.pathUpdateHandler will have the NWPath.gateways variable set to the gateways IPs.

let monitor = NWPathMonitor(requiredInterfaceType: .wifi)
monitor.pathUpdateHandler = { path in
    print(path.gateways)
}
monitor.start(queue: DispatchQueue(label: "nwpathmonitor.queue"))