# Forward trace: where did this part go? (/docs/api-reference/traceability/TraceabilityController_forward)

`GET /api/factories/{factoryId}/traceability/forward`

Base URL: https://api.xentr.ai

Authentication: bearer token (`Authorization: Bearer <token>`).

## Parameters

| Name | In | Required | Type | Description |
| --- | --- | --- | --- | --- |
| `factoryId` | path | yes | string | Factory ID |
| `serial` | query | no | string | Serial number to trace |
| `lot` | query | no | string | Lot/batch ID to trace |

## Responses

### 200: Forward trace tree