Singapore Post 4-State Postal Code
Singapore Post Mail 4-State Postal Code (also known as Singapore 4-State Postal, SingPost 4-State, SingPost Barcode, and Singapore 4-State Code) is used by Singapore Post for postal code and automatic mail sorting. It is identical to the Royal Mail 4-State Customer Barcode (CBC) that was developed by Royal Mail in the United Kingdom.
CBC is defined in the Royal Mail Mailsort User Guide: Mailsort 700 document.
The symbol comprises the following elements:
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Leading quiet zone
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Start bar (a single tracker, ascender bar)
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Symbol characters that represent data
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Check digit
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Stop bar (a single tracker, ascender, descender bar)
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Trailing quiet zone
The data characters represent sorting rules and other information. Each character is made up of four separate bars. The term "4-state" is derived from the fact that each bar in this symbology is in one of four states. The names of the four states are as follows:
These are illustrated in the following diagram:
This symbology supports the following alphanumeric characters:
Singapore Post Mail 4-State Postal Code contains a check digit that is based on the modulo 6 (mod 6) algorithm.
The minimum length of this symbology is 35.98 mm, and the maximum length is 68.58 mm. The density of the code is 20 to 24 bars per 25.4 mm. All bars must be evenly spaced.
Singapore Post Mail 4-State Postal Code requires a quiet zone space of at least 2 mm on all sides.
To correctly position this barcode symbol, it must be within the following margins:
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No less than 18 mm up from the bottom edge of the piece of mail
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No more than 120 mm up from the bottom edge of the piece of mail
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No less than 15 mm down from the top edge of the piece of mail
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No less than 15 mm from either side of the piece of mail
The barcode can be printed at 0, 90, 180, or 270 degrees.
Symbol Structure