What is a Tracking Number?

UPS tracking numbers appear in the following formats:

  • 1Z9999999999999999
  • 999999999999
  • T9999999999
  • 999999999

UPS will also track the following types of tracking numbers, which contain from seven to 20 characters:

  • Delivery Order/Sub-PRO Number: Less-Than-Truckload (LTL)/and Truckload (TL) child shipment tracking numbers 
  • House Air Waybill: Used for air freight movement
  • House Bill of Lading: Used for ocean freight movement
  • PRO Number: Used for surface freight movement
  • UPS InfoNotice: A bar-coded notice, which includes a 12-digit reference number, given on the first delivery attempt in select countries
  • UPS Service Notice: A notice given on first delivery attempt in select countries

UPS Mail Innovations Tracking Numbers

You can track your UPS Mail Innovations piece on both ups.com and upsmi.com. UPS Mail Innovations tracking numbers differ from a small package reference number in length and terminology.

UPS Mail Innovations tracking numbers appear in the following formats:

  • United States Postal Service Delivery Confirmation Number: a 22-34 numerical identifier assigned by the US Postal Service when Delivery Confirmation is requested
  • Sequence Number (MMS/MMI Number): an 18-digit number assigned internally by UPS Mail Innovations or UPS WorldShip
  • Mail Innovations Compliant Package ID: a barcode-type identifier assigned by the shipper to each mail piece, using the structure below:


This indicator is made up of the following three components:

    • MI – a UPS Mail Innovations indicator
    • XXXXXX –- a unique 6-digit customer number assigned by UPS Mail Innovations
    • NNNNNNNNNNNNNNNNNNNNNN –  a unique number, up to 22 characters, assigned by the shipper to identify a mail piece. Use alpha and/or numeric characters with no spaces or symbols. The same ID should not be reused for other mail pieces for at least six months.

UPS Freight Less-than-Truckload (“LTL”) transportation services are offered by TFI International Inc., its affiliates or divisions (including without limitation TForce Freight), which are not affiliated with United Parcel Service, Inc. or any of its affiliates, subsidiaries or related entities (“UPS”). UPS assumes no liability in connection with UPS Freight LTL transportation services or any other services offered or provided by TFI International Inc. or its affiliates, divisions, subsidiaries or related entities.