---
title: Assignment Update
slug: fourkites-api-reference/assignment-update
createdAt: 2024-02-05T06:49:16.000Z
---

`AssignmentUpdate` keys can have one or more fields (given below) of tracking assignment to the FourKites load.

## Field Specifications

| Attribute             | Type   | Description                                                                                                                                                                                                                        | Example            | Mandatory (M)/ Optional (O) |
| --------------------- | ------ | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ------------------ | --------------------------- |
| operatingCarrierScac  | String | Enter the SCAC assigned by a Managing Carrier (3PL or broker) to an Operating Carrier. When a Carrier brokers out a load to another Operating Carrier, this field will be used to identify the load in an operating carrier's file | "supc"             | O                           |
| truckNumber           | String | Enter the tractor number assigned to the load                                                                                                                                                                                      | "TrucktoTrack"     | O                           |
| trailerNumber         | String | Enter the trailer number assigned to the load                                                                                                                                                                                      | "TrailertoTrailer" | O                           |
| deviceId              | String | Enter the device id number assigned to the load                                                                                                                                                                                    | "DeviceIdtoTrack"  | O                           |
| driverPhone           | String | Enter the phone number of the driver currently assigned to the load. The phone number must start with a "+" sign followed by the ISD code and then the mobile number                                                               | "+19999999999"     | O                           |
| driverName            | String | It indicates the name of the driver                                                                                                                                                                                                | "Jack"             | O                           |
| driverLicenseNumber   | String | It indicates the driver’s truck license number                                                                                                                                                                                     | "AU 73777"         | O                           |
| railEquipmentInitials | String | Enter the 4-character rail equipment prefix                                                                                                                                                                                        | "AXYZ"             | O                           |
| railEquipmentNumber   | String | Enter the 6-digit rail equipment number                                                                                                                                                                                            | "985472"           | O                           |
| wagonNumber           | String | Enter the Wagon Number if applicable                                                                                                                                                                                               | "BOXN 10"          | O                           |
| oceanContainer        | String | Enter the Ocean Container if applicable. Note: this field is mandatory if any ocean mode event updates                                                                                                                             | "ABC12345678"      | O                           |