POSTNET is a delivery point barcodes adopted by United States Postal Services, which is also known as USPS POSTNET Barcode, USPS POSTAL Numeric Encoding Technique Barcode, Delivery Point Barcode (DPBC), Postnet 3 of 5. POSTNET barcodes is short for Postal Numeric Encoding Technique for sorting and directing mail.

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POSTNET Character Set

Character Set Types: Numeric-only

Character Set Breakdown:

• 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
  
  

Codabar Data Length

Data Length Types: Fixed-length (5-, 9- or 11- digit)

(Data Length in digits)

POSTNET Structure Introduction

POSTNET barcode is one type of height-modulated state barcode, which uses two tall and three short bars to encode each POSTNET Code digit. Binary 0 represents the short bar or half bar and binary 1 represents tall bar or full bar.

POSTNET barcode has three formats: 5-digit ZIP code, a 9-digit ZIP+4 code, or an 11-digit Delivery Point Code. Each POSTNET barcode consists of 4 parts: a starting & stopping quiet zone, two frame bars, message data and a check digit.

Quiet Zone

Quiet zone is a white space surrounding the POSTNET barcode image, which is able to protect the POSTNET symbol. You may set quiet zone of left, right, top, and bottom according to your needs.

Frame Bar

Frame Bar may be regarded as the start & stop pattern of POSTNET barcodes, which encoded as a single 1.

Message Data

Message Data is used for encoding the zip of the addressee in a machine readable format. Often, Message Data can be encoded into 3 different lengths:

• 5-digits POSTNET bar code: 5 digit long zip code
  
  
• ZIP + 4 POSTNET bar codes: 9 digit long zip code
  
  
• DPBC POSTNET bar code (Delivery Point bar code): 9 digit long zip code + 2 DPBC digits
  
  

Check Digit

All printed POSTNET Codes include an additional checksum digit or correction character, calculated on Modulo 10. This digit must always be the single digit number (i.e., 0-9) that, when added to the sum of the other digits in the barcode, will produce an even multiple of 10.