Locating a Device Identifier
Locate a device’s identifier to register it as a development device with Member Center.
For iOS apps, connect your device to your Mac.
In the devices window under Devices, select your device.
The device identifier appears in the Identifier field.
If you are registering multiple devices for development or testing with Member Center, you need to locate the device IDs or use iPhone Configuration Utility to create a devices file that you upload to Member Center.