Intelligent Mail is a height-modulated barcode symbology that may encode up to 31 decimal digits of mail section data into 65 vertical bars. Intelligent Mail barcode was published by United States Postal Services (USA) in 2003.

Intelligent Mail barcode symbology is also renowned with other names such as One Code Solution and 4-State Customer Barcode shortened 4CB, 4-CB or USPS4CB, USPS IM.

Character set of Intelligent Mail barcode symbology

The character set of Intelligent Mail barcode symbology contains following elements:

• Digits (0-9)

• Automatic check digit

Structure of Intelligent Mail barcode symbology

Intelligent mail can encode tracking number containing 20 digits with a routing number or delivery point zip code that may composed of 0 to 11 digits in length.

• Tracking Code

 Tracking Code contains following sections:

• Barcode Identifier includes 2 digits assigned by USPS.

• Service Type Identifier 3 is composed of 3 digits also assigned by USPS.

• Mailer Identifier contains 6 or 9 digits in length depending on the serial number.

• Serial Number consists of 6 digits if used with 9 digits Mailer ID and 9 digits when used with 6 digits Mailer ID.

• Routing Number

  The routing number or delivery point zip code assigned by the mailer for mail segment routing. Mailer can leave the routing number empty or set to 5, 9 or 11 digits.

Applications of Intelligent Mail barcode symbology

• Used for tracking letters and flats.

• Capability to sort individual mail pieces with customer’s provision of greater visibility into mail stream.

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