Apple ID

Hi. You may check this article: Manage your associated devices in iTunes - Apple Support

You can see the devices associated with your Apple ID in iTunes on your Mac :

1. Click toopen your account in iTunes, or use these steps:
   1. Open iTunes, select Store /Sign In, then enter your Apple ID and password.
   2. Select Store / View Account.
2. Click Manage Devices in the iTunes in the Cloud section.

Next to each device, you can see when it associated with your Apple ID.