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Postnet Barcode

POSTNET (Postal Numeric Encoding Technique) was designed by U.S Post Office for encoding zip code information.

Character set

Character set of POSTNET barcode symbology consists of numbers (0-9) containing a length of 12-14 digits.

Structure of POSTNET

Structure of POSTNET has start/stop character in form of full bars, numbers (0 to 9) of variable length. Each character is represented using five bars – three are small and left two includes long bars and check digit (calculated according to modulo 10).

Applications

Mainly used for tracking zip code information and improving speed & delivery of mails in U.S Postal Office.

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