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UPS's Tracking numbers provide the capability to identify and trace a shipment as it moves through the UPS system to its destination. UPS automatically assigns a tracking number to your shipment. UPS will also track other types of tracking numbers, using unique numeric formats that contain from four to 20 characters. These types include UPS InfoNotice numbers, UPS Service Notice numbers, PRO numbers, House Air Waybill numbers, and House Bill of Lading numbers.