Feature Description

LEADTOOLS provides fast, highly accurate, and reliable USPS and 4-State Barcode detection, reading, and writing support for .NET (C# & VB), C/C++, WinRT, iOS, macOS, Java, and web developers. The award-winning LEADTOOLS libraries help programmers add fully featured USPS and 4-State Barcode technology to their applications in record time.

LEADTOOLS supports several 2-state and 4-state barcode symbologies employed throughout the world by various post mail office systems. These barcodes are comprised of bars of different heights, as opposed to different widths that most linear 1D barcodes employ. 2-state barcodes are able to encode the digits 0-9 and are effectively used for zip codes, routing numbers, and tracking numbers, while 4-state barcodes can encode alphanumeric characters to encode the entire address.

LEADTOOLS USPS and 4-State Barcode SDK Symbols

Postal Numeric Encoding Technique (POSTNET)


POSTNET was developed by the United States Postal Service (USPS) to represent the 5 or 9 digit ZIP code or an 11 digit "Delivery Point Code" of US destination addresses. A POSTNET symbol can be printed upon an envelope and be used to facilitate faster mail sorting. These symbols are printed upon flat pieces of mail such as magazines and envelopes.

Post Alpha Numeric Encoding Technique (PLANET)

PLANET Barcode

PLANET is similar to POSTNET in that it uses half and full height bars to encode data, always begins and ends with a full bar, and digits are represented using a two of five code. The major difference between POSTNET and PLANET is that in POSTNET full bars represent "on" bits while in PLANET full bars represent "off" bits. PLANET is used by the United States Postal Service to identify and track mail during delivery.

USPS 4-State Customer Barcode (USPS4CB)/Intelligent Mail Barcode

USPS 4-State Barcode

Intelligent Mail Barcode, more commonly known as 4-State Customer Barcode or USPS4CB, is a 65-bar code used by the United States Postal Service for domestic delivery. It is designed to provide improved functionality and information than its predecessors POSTNET and PLANET. It effectively combines the routing ZIP code and tracking information into a single barcode.

Royal Mail (RM4SCC)/CBC (Customer Bar Code)

Royal Mail 4-State Barcode

The RM4SCC symbol is used by the Royal Mail Cleanmail service. The Royal Mail Service has specific requirements placed upon this symbol to ensure maximum readability and efficiency during the mail routing process.

Australia Post 4-State

Australian 4-State Barcode

Australia Post 4-State is used by Australia Post for postal code and automatic mail sorting. Australia Post has chosen the 4-State barcode, a derivation that is already used successfully by other postal administrations. It comprises four types of bars (the four states), each of which has a distinct name, value, and barcode symbol.

Other Types of Linear 1D Barcodes

Technology Related to USPS and 4-State Barcode