How to get a unique device ID in Swift?

You can use devicecheck (in Swift 4) Apple documentation

func sendEphemeralToken() { //check if DCDevice is available (iOS 11) //get the **ephemeral** token DCDevice.current.generateToken { (data, error) in guard let data = data else { return } //send **ephemeral** token to server to let token = data.base64EncodedString() //Alamofire.request("https://myServer/deviceToken" ... } } 

Typical usage:

Typically, you use the DeviceCheck APIs to ensure that a new user has not already redeemed an offer under a different user name on the same device.

Server action needs:

See WWDC 2017 — Session 702 (24:06)

more from Santosh Botre article - Unique Identifier for the iOS Devices

Your associated server combines this token with an authentication key that you receive from Apple and uses the result to request access to the per-device bits.

For Swift 3.X Latest Working Code, Easily usage;

 let deviceID = UIDevice.current.identifierForVendor!.uuidString print(deviceID) 

You can use identifierForVendor public property present in UIDevice class

let UUIDValue = UIDevice.currentDevice().identifierForVendor!.UUIDString print("UUID: \(UUIDValue)") 

EDIT Swift 3:

UIDevice.current.identifierForVendor!.uuidString 

END EDIT

Swift 2.2

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool { let userDefaults = NSUserDefaults.standardUserDefaults() if userDefaults.objectForKey("ApplicationIdentifier") == nil { let UUID = NSUUID().UUIDString userDefaults.setObject(UUID, forKey: "ApplicationIdentifier") userDefaults.synchronize() } return true } //Retrieve print(NSUserDefaults.standardUserDefaults().valueForKey("ApplicationIdentifier")!) 

In swift 4,5 You can get UUID using below code.

print(UIDevice.current.identifierForVendor!.uuidString) 

Output

Apart from that you can get multiple properties from connected Device.

 UIDevice.current.name // e.g. "My iPhone" UIDevice.current.model // e.g. @"iPhone", @"iPod touch" UIDevice.current.localizedModel // localized version of model UIDevice.current.systemName // e.g. @"iOS" UIDevice.current.systemVersion // e.g. @"15.5" 

On iOS we commonly mistake things such as UDID & UUID string. Actually both are different.

Looking based on most of the answers given is UUID, where else the question was about UDID.

1. UUID - Is not unique, every app re-install or factory reset the identifier value will change.

   Example : UUID().uuidString

2. UDID - Is a unique value. This specifically refers to your device, can't be obtain programatically.

If, like me, you were trying to get the unique device identifier for devices you manage with a mobile device management (MDM) system, you can use Managed App Configuration.

There is a special part of UserDefaults you can use that your MDM system can change and you can read on the app side:

UserDefaults.standard.object(forKey: "com.apple.configuration.managed")

For the device ID, you could decide to call your key deviceID (but it can be anything) and read it from the UserDefaults above in your app. Then on the MDM side you would set this variable to the device's ID.

In most MDM systems, there are several variables, among which are device serial number, device ID, MEID, mac address, etc. In the app's managed configuration section, add your key deviceID and set it to a variable like serial number provided by your MDM system. The MDM system will then update the special managed UserDefaults section with that key and a different value depending on the device where it's installed, allowing you to access the value from the app.

if (UIDevice.current.identifierForVendor?.uuidString) != nil { self.lblDeviceIdValue.text = UIDevice.current.identifierForVendor?.uuidString }