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POSTNET Barcode stands for POSTal Numeric Encoding Technique. It was developed by Postal Service for automatic mailpieces sorting.POSTNET barcode always begins with a frame bar and ends with another frame bar. A correction character is required to be put in front of the right frame bar.It is able to encode five-digit ZIP code, nine-digit ZIP and eleven-digit delivery point code.Barcodesoft POSTNET barcode package contains 3 fonts: postnet, planet and envelope.