You can track your UPS Mail Innovations shipment on both ups.com and upsmi.com UPS Mail Innovations tracking numbers differ from small package tracking numbers in length and terminology.
UPS Mail Innovations Tracking Numbers come in the following formats:
United States Postal Service Delivery Confirmation Number: The numeric identifier 22-34 assigned by the United States Postal Service when a delivery confirmation request is requested.
Serial Number (MMS / MMI Number): An 18-digit number assigned internally by UPS Mail Innovations or UPS Worldship.
Mail Innovations Compliant Package ID: The barcode type identifier assigned by the shipper to each mail piece using the structure below:
MIZZZZZZZZXXXXXXXXXXXXXXXXXXXXXXX.
This indicator consists of the following three components:
MI - UPS Mail Innovations Indicator
ZZZZZZZZ - is a unique 6-digit customer number assigned by UPS Mail Innovations
XXXXXXXXXXXXXXXXXXXXXXX - is a unique number, up to 22 characters, assigned by the shipper to identify the mail item. Use alphabetic and / or numeric characters without spaces or symbols. The same identifier should not be reused for other mailings for at least six months.