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.
USPS Registered Mail
RA 000 000 000 US
9208 8000 0000 0000 0000 00
Canada Post
The most common tracking number format:
13 alphabetic and numeric characters, usually starting with 2 alphabets, following by 9 digits, and ending by "CA" <br>