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The POSTNET (Postal Numeric Encoding Technique) barcode is a linear barcode symbology used by the United States Postal Service (USPS) for encoding ZIP codes and delivery point information on mailpieces. It facilitates efficient sorting and delivery of mail by automated postal sorting machines. Let's delve into the components and structures of the POSTNET barcode system in detail.

Components of POSTNET Barcode

1.Barcode Elements:

Bars: The POSTNET barcode consists of bars and spaces of varying widths. These bars represent binary patterns that encode numeric data.

Guard Bars: These are the start and stop patterns that indicate the beginning and end of the barcode. They provide reference points for barcode scanners.

2.Digits:

The data encoded in a POSTNET barcode consists solely of numeric digits (0-9).

It typically encodes ZIP codes, ZIP+4 codes, or delivery point codes.

Structure of POSTNET Barcode

1.ZIP Code Conversion:

The ZIP code is converted into a binary representation using a set of rules defined by USPS.

Each digit of the ZIP code is converted into a corresponding set of bars and spaces.

2.Barcode Composition:

Start Frame: The barcode begins with a start frame, which is a unique pattern of bars and spaces that indicates the start of the barcode data.

Bar Patterns: Each digit of the ZIP code is represented by a specific pattern of bars and spaces.

A '1' is represented by a single bar.

A '0' is represented by a single space.

Check Digit: In some variations of POSTNET, a check digit may be included to ensure accuracy during scanning and decoding.

3.Encoding Example:

Let's encode the ZIP code '12345' using POSTNET:

ZIP Code: 12345

Binary Representation: 00011 00101 00110 00110 01001

POSTNET Barcode:

Start Frame: Typically '1'

Encoded Bars:

For '1': bar, space, space, space, bar (representing 00011)

For '2': bar, space, space, bar, space (representing 00101)

For '3': bar, space, bar, space, space (representing 00110)

For '4': bar, space, bar, space, space (representing 00110)

For '5': bar, space, space, bar, space (representing 01001)

End Frame: Typically '1'

4.Spacing and Dimensions:

The spacing between bars and the width of bars are critical to ensure proper scanning and decoding by USPS sorting machines.

The overall length of the barcode varies depending on the length of the ZIP code or ZIP+4 code being encoded.

5.Decoding:

Barcode scanners decode the POSTNET barcode by interpreting the widths and patterns of bars and spaces.

The decoded information typically includes the ZIP code, ZIP+4 code, or delivery point information.

6.Variants:

ZIP+4 Encoding: For more precise delivery, USPS developed a variant called the POSTNET-52 or POSTNET-62, which encodes ZIP+4 codes or delivery point information.

Delivery Point Barcode (DPBC): This variant includes delivery point information in addition to ZIP+4, allowing for even finer sorting and delivery accuracy.

Conclusion

The POSTNET barcode system is a fundamental tool used by USPS to streamline mail sorting and delivery processes. By encoding ZIP codes and delivery point information into a series of bars and spaces, it enables automated sorting machines to efficiently handle large volumes of mail. Understanding its components and structure is crucial for implementing and utilizing this barcode technology effectively within the postal service industry.

This overview provides a detailed exploration of how the POSTNET barcode system works, from its basic components like bars and digits to its structured encoding of ZIP codes and delivery point information.

EasierSoft Barcode Label Design & Bulk Printing Software

---- Use Excel Data to Batch Print Barcodes on Label Sheets or Roll Labels  

---- How to use this barcode software

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Once you obtain a GS1/UPC/EAN barcode, or other barcode type and QR code, you can use our free software to batch print barcode labels onto Roll label paper using a professional label printer, or to batch print barcodes onto Avery 5160 label sheets using a regular laser or inkjet printer. Our software has free and paid versions.

The free version fully meets your needs for batch printing GS1/UPC/EAN barcodes. The paid version can import data from Excel and databases to batch print barcode labels with different values.

How to Use & FAQ:

Highlights

Excel integration: Import data directly from Excel to generate and print barcodes in bulk.

Label designer: Create complex labels with multiple barcodes, text, logos, and shapes.

Batch printing: Print thousands of barcodes at once using standard inkjet/laser printers or professional barcode printers.

Flexible editions:

Standard Edition: Simple batch printing with Excel data.

Professional Edition: Adds command-line automation for workflow integration.

Label Designer Edition: Advanced design features for complex labels.

Why Choose Our Barcode Solutions?

Cost-effective: Free online generator and permanent free desktop version available.

Easy to use: No technical expertise required—just input data and print.

Versatile: Supports nearly all 1D and 2D barcode types, including QR codes.

Trusted: Recommended by CNET and widely downloaded by users worldwide.

Suitable Use Cases

Small businesses and startups needing quick barcode labels for products.

Retailers and online sellers managing inventory with batch barcode printing.

Manufacturers requiring sequential or custom barcode labels for packaging.

Educational and testing environments where barcodes are used for tracking.