# instanceIds

> The instance ID for each root GameObject of the prefab instances that have been updated.

## Definition

* **Type:** Property
* **Namespace:** [UnityEditor](/engine/6000.5/script-reference/unityeditor.md)
* **Assembly:** UnityEditor.CoreModule

> **Warning:**
>
> **Removed.** instanceIds is deprecated. Use entityIds instead.

```csharp
public NativeArray<int>.ReadOnly instanceIds { get; }
```