The POSTNET (POSTal Numeric Encoding Technique) barcode was developed by the United States Postal Service for encoding ZIP-codes and correct sorting using BCSs. It can encode ZIP, ZIP+4, and ZIP+4+2 postal codes.
Valid symbols: |
0123456789 |
Length: |
Fixed, 5, 9 or 11 characters |
Check digit: |
One, algorithm modulo-10 |
The Postnet barcode can encode 0-9 digits. The barcode consist of short and long bars. Each symbol of data is encoded using five bars. This barcode contains only one check symbol, that is calculated by the modulo-10 algorithm.
A "Postnet" barcode. "11387975204" is a number encoded in the barcode.