Are Push Notifications tokens unique to Mac & iOS?

Question

By that I mean: If you have an app running on both platform, can you be sure that a given token on iOS isn't attributed to Mac? I'm pretty sure this isn't something we can "know" (Apple internal) and I shouldn't assume it, but I'm really curious what happens if you (by mistake) send an "iOS" Push (intended for your iOS App) to a Mac token. Could it reach another iOS user?! I guess potentially...

Imagine the following case (simplified):

• You know you have to send a push to the token "foo" to your Mac app.
• You mistakenly send a push to "foo" on your iOS app.
• I hope it would land in void land / you'd get an error back from APNS but I guess it might also land on a "random" user of your iOS app, which is not the user intended (on the Mac app)

Answer 1

Sending a push notification requires an SSL certificate from Apple that is bound to your iOS or Mac application. Therefore it can not happen that a notification for an iOS app is sent to a Mac app.

Answer 2

From the following quote it doesn't seem possible that the same device token will be assigned to both an iOS device and a Mac (or to two iOS devices or to two Macs), since device tokens contain device IDs, and device IDs should be unique (otherwise they wouldn't be very useful IDs).

Every notification that a provider sends to APNs for delivery to a device must be accompanied by the device token it obtained from an application on that device. APNs decrypts the token using the token key, thereby ensuring that the notification is valid. It then uses the device ID contained in the device token to determine the destination device for the notification. ( Source )