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Barcode POSTNET

Tool to generate/decode POSTNET barcodes. POSTNET (Postal Numeric Encoding Technique) is a barcode standard used in the United States for mail routing.

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Barcode POSTNET -

Tag(s) : Character Encoding, Image Processing

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# Barcode POSTNET

## Barcode POSTNET Generator

 Checksum Add the control character Already included in the coded value Ignore (no control)
 Output format Image Binary Data 0=Empty and 1=Black bar Checksum value

### Options

 Output format Numerical Value of the Barcode Image

### How to encrypt using Barcode POSTNET cipher?

The POSTNET Barcode format allows coding only numbers. It generally contains the ZIP postal code (5 digits) and sometimes 4 additional digits (ZIP+4) for the Delivery point (DP) which corresponds to an even more precise mail collection point.

Each digit is coded in 5 bits, represented by short or long bars. The POSTNET correspondence table is:

 0 1 11000 00011 00101 00110 01001 01010 01100 10001 10010 10100

A complete POSTNET barcode begins and ends with a bit 1 (long line), it also includes a check digit before the final 1.

### How to decrypt Barcode POSTNET cipher?

The decryption of the POSTNET Code consists of reading binary short (= 0) and long (= 1) bands and then translating them via the coding table.

Example: A message 1 00011 00101 00110 1 translates to 123

POSTNET checksum is missing in this example

### How to calculate the checksum characters?

The POSTNET code uses a basic checksum: add all the digits and keep the digit of units $N$. The checksum is $10 - N \mod 10$.

Example: The number 678 has for sum of digits $6+7+8 = 21$, the unit digit is $1$. The checksum is $10 - 1 = 9$.

### How to recognize POSTNET Barcode?

The POSTNET barcode has a graphic form made up of long and short lines.

The POSTNET barcode has a variable length.

The POSTNET barcode begins and ends with a long line.

The binary reading of the POSTNET barcode has a length equal to 2 modulo 5 (because 2 bits 1 are added both the beginning and at the end and the remaining characters are on 5 bits).

## Source code

dCode retains ownership of the "Barcode POSTNET" source code. Except explicit open source licence (indicated Creative Commons / free), the "Barcode POSTNET" algorithm, the applet or snippet (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, breaker, translator), or the "Barcode POSTNET" functions (calculate, convert, solve, decrypt / encrypt, decipher / cipher, decode / encode, translate) written in any informatic language (Python, Java, PHP, C#, Javascript, Matlab, etc.) and all data download, script, or API access for "Barcode POSTNET" are not public, same for offline use on PC, mobile, tablet, iPhone or Android app!
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Barcode POSTNET on dCode.fr [online website], retrieved on 2024-06-25, https://www.dcode.fr/barcode-postnet

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