OneCode
OneCode is a four-state system used by the US Postal Service mailstream. It is also known as the USPS 4-State Customer Barcodes (4CB). The code combines the routing ZIP code and tracking information into a single fixed length code. OneCode barcodes are clocked codes consisting of 65 bars, each of which may be one of four heights.
OneCode
The data for OneCode symbols consists of 20 digits of tracking information and 0, 5, 9 or 11 digits for a Delivery Point ZIP code. The allowed data lengths are 20, 25, 29 or 31 digits.
The tracking informat consists of:
Barcode Identifier (2 digits, second digit must be 0 –
4)
Special Services (3 digits)
Customer Identifier (6 digits)
Sequence
number (9 digits)
The first three items are assigned by USPS, while the Sequence number is assigned by the mailer.
OneCode symbols contain an 11 bit CRC check sequence.
During 2007 the size of the bars specified in the OneCode standard was reduced. dLSoft products dated after November 2007 incorporate this change.
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