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Intelligent Mail® Barcode

The Intelligent Mail® barcode (IMb) is used to sort and track letters, cards and flats and offers greater versatility by allowing many services to be requested and embedded within one barcode. The Intelligent Mail barcode combines the data of the existing POSTNET™ and the PLANET Code® barcodes, as well as other data, into a single barcode. 

Who is the IMb for?

First Class Mail
Standard Mail


The Intelligent Mail barcode is a 65-bar Postal Service™ barcode used to sort and track letters and flats. It allows mailers to use a single barcode to participate in multiple Postal Service programs simultaneously, expands mailers' ability to track individual mailpieces, and provides greater mail stream visibility.

The IMb is required for use on letters and flats prepared for automation prices. This requirement affects First-Class Mail postcards, Insured Mail, Certified Mail, and any other mail using extra services currently available and appropriate for the class and shape of mail prepared for automation prices.

Registered Mail is ineligible for automation prices because of the way it is handled during processing.

There are three options for using the IMb: non-automation, basic automation, and Full-Service. In each of these cases, you'll want to ensure that you've tested your barcodes for compatability and accuracy or work with certified vendors. 

No vendor information posted for this page yet.

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Related Products

Intelligent Mail® Package Barcode (IMpb) ACS™

IMpb ACS allows parcel mailers who print the Intelligent Mail package barcode to receive an electronic address correction using that barcode.

Intelligent Mail® Barcode (IMb) Encoder Software and Fonts

The Postal Service provides Intelligent Mail® barcode files, fonts and encoders, available for download.


For questions, please call 1-877-640-0724Image removed. or email

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