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# CKNotification.ID

An object that uniquely identifies a push notification that a container sends.

```
class ID
```

## Overview

You don’t create notification IDs directly. The server creates them when it creates instances of [`CKNotification`](/documentation/CloudKit/CKNotification) that correspond to the push notifications that CloudKit sends to your app. You can compare two IDs using the <doc://com.apple.documentation/documentation/ObjectiveC/NSObjectProtocol/isEqual(_:)> method to determine whether two notifications are the same. This class defines no methods or properties.

---

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