Swift - Get device's WIFI IP Address

Question

I need to get IP Address of iOS device in Swift. This is not a duplicate of other questions about this! I need to get only WiFi IP address, if there is no wifi ip address - I need to handle it. There are a few questions about it on Stack Overflow, but there are only functions that return ip addresses. For example (from How to get Ip address in swift):

func getIFAddresses() -> [String] {     var addresses = [String]()      // Get list of all interfaces on the local machine:     var ifaddr : UnsafeMutablePointer<ifaddrs> = nil     if getifaddrs(&ifaddr) == 0 {          // For each interface ...         for (var ptr = ifaddr; ptr != nil; ptr = ptr.memory.ifa_next) {             let flags = Int32(ptr.memory.ifa_flags)             var addr = ptr.memory.ifa_addr.memory              // Check for running IPv4, IPv6 interfaces. Skip the loopback interface.             if (flags & (IFF_UP|IFF_RUNNING|IFF_LOOPBACK)) == (IFF_UP|IFF_RUNNING) {                 if addr.sa_family == UInt8(AF_INET) || addr.sa_family == UInt8(AF_INET6) {                      // Convert interface address to a human readable string:                     var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)                     if (getnameinfo(&addr, socklen_t(addr.sa_len), &hostname, socklen_t(hostname.count),                         nil, socklen_t(0), NI_NUMERICHOST) == 0) {                             if let address = String.fromCString(hostname) {                                 addresses.append(address)                             }                     }                 }             }         }         freeifaddrs(ifaddr)     }      return addresses } 

Here I get 2 values - address from mobile internet(I think) and WiFi address I need. Is there any other way to get ONLY WiFi IP Address?

Answer 1

According to several SO threads (e.g. What exactly means iOS networking interface name? what's pdp_ip ? what's ap?), the WiFi interface on an iOS device always has then name "en0".

Your code (which seems to be what I answered at How to get Ip address in swift :) retrieves a list of the IP addresses of all running network interfaces. It can easily be modified to return only the IP address of the "en0" interface, and actually that is what I originally had answered at that thread (and this is just a Swift translation of the answer to how to get ip address of iphone programmatically):

// Return IP address of WiFi interface (en0) as a String, or `nil` func getWiFiAddress() -> String? {     var address : String?      // Get list of all interfaces on the local machine:     var ifaddr : UnsafeMutablePointer<ifaddrs> = nil     if getifaddrs(&ifaddr) == 0 {          // For each interface ...         var ptr = ifaddr         while ptr != nil {             defer { ptr = ptr.memory.ifa_next }              let interface = ptr.memory              // Check for IPv4 or IPv6 interface:             let addrFamily = interface.ifa_addr.memory.sa_family             if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {                  // Check interface name:                 if let name = String.fromCString(interface.ifa_name) where name == "en0" {                      // Convert interface address to a human readable string:                     var hostname = [CChar](count: Int(NI_MAXHOST), repeatedValue: 0)                     getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.memory.sa_len),                                 &hostname, socklen_t(hostname.count),                                 nil, socklen_t(0), NI_NUMERICHOST)                     address = String.fromCString(hostname)                 }             }         }         freeifaddrs(ifaddr)     }      return address } 

Usage:

if let addr = getWiFiAddress() {     print(addr) } else {     print("No WiFi address") } 

---

Update for Swift 3: In addition to adopting the code to the many changes in Swift 3, iterating over all interfaces can now use the new generalized sequence() function:

Do NOT forget to add #include <ifaddrs.h> in your bridging header

// Return IP address of WiFi interface (en0) as a String, or `nil` func getWiFiAddress() -> String? {     var address : String?      // Get list of all interfaces on the local machine:     var ifaddr : UnsafeMutablePointer<ifaddrs>?     guard getifaddrs(&ifaddr) == 0 else { return nil }     guard let firstAddr = ifaddr else { return nil }      // For each interface ...     for ifptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {         let interface = ifptr.pointee          // Check for IPv4 or IPv6 interface:         let addrFamily = interface.ifa_addr.pointee.sa_family         if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {              // Check interface name:             let name = String(cString: interface.ifa_name)             if  name == "en0" {                  // Convert interface address to a human readable string:                 var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))                 getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.pointee.sa_len),                             &hostname, socklen_t(hostname.count),                             nil, socklen_t(0), NI_NUMERICHOST)                 address = String(cString: hostname)             }         }     }     freeifaddrs(ifaddr)      return address } 

---

For those of you who came looking for more than the WIFI IP you could modify this code a little

func getAddress(for network: Network) -> String? {     var address: String?      // Get list of all interfaces on the local machine:     var ifaddr: UnsafeMutablePointer<ifaddrs>?     guard getifaddrs(&ifaddr) == 0 else { return nil }     guard let firstAddr = ifaddr else { return nil }      // For each interface ...     for ifptr in sequence(first: firstAddr, next: { $0.pointee.ifa_next }) {         let interface = ifptr.pointee          // Check for IPv4 or IPv6 interface:         let addrFamily = interface.ifa_addr.pointee.sa_family         if addrFamily == UInt8(AF_INET) || addrFamily == UInt8(AF_INET6) {              // Check interface name:             let name = String(cString: interface.ifa_name)             if name == network.rawValue {                  // Convert interface address to a human readable string:                 var hostname = [CChar](repeating: 0, count: Int(NI_MAXHOST))                 getnameinfo(interface.ifa_addr, socklen_t(interface.ifa_addr.pointee.sa_len),                             &hostname, socklen_t(hostname.count),                             nil, socklen_t(0), NI_NUMERICHOST)                 address = String(cString: hostname)             }         }     }     freeifaddrs(ifaddr)      return address } 

enum Network: String {     case wifi = "en0"     case cellular = "pdp_ip0"     //... case ipv4 = "ipv4"     //... case ipv6 = "ipv6" } 

Then we have access to the cellular IP as well.

guard let wifiIp = getAddress(for: .wifi) else { return }

&

guard let cellularIp = getAddress(for: .cellular) else { return }