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What is a Tracking Number?
Tracking numbers are used by UPS to identify and trace shipments as they move through the UPS system to their destination. UPS automatically assigns a tracking number to your shipment.

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 first delivery attempt in select countries
  • UPS Service Notice: A notice given on first delivery attempt in select countries

UPS Mail Innovations Tracking Numbers


UPS Mail Innovations® uses tracking numbers to identify and track shipments as they move through the UPS Mail Innovations network and the United States Postal Service®, which makes the final delivery. With your tracking number, 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 U.S. 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:
MIXXXXXXNNNNNNNNNNNNNNNNNNNNNN

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.

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