Go to the USPS Website 		Intelligent Mail® Barcode
RIBBS Intelligent Mail® Barcode Resource Download Site Mailer ID Guidelines

Documents:

Mailer ID Usage Guidelines - Mailer ID (MID) Assignment Guidelines for Letters, Flats, and Parcels. Find answers to frequently asked questions on MID usage.

Mailer ID and the Intelligent Mail Barcode - Mailer ID (MID) format within the Intelligent Mail barcode.

If you need assistance, please contact the U. S. Postal Service
National Customer Support Center at 877-640-0724, option 2
or email the NCSC at onecodesolution@usps.gov