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Royal Mail 4-State Customer Code (RM4SCC)

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RM4SCC turns a UK postcode plus delivery point suffix into a row of four-state bars. Each character uses four bars, two of them long, and a final check character catches reading errors.

Also called RM4SCC, CBC (Customer Bar Code), Royal Mail barcode, Cleanmail barcode.

In this family

Specifications

StandardRoyal Mail specification
Character setA-Z and 0-9 (36 characters, 4 bars each)
CapacityVariable: UK postcode + 2-character Delivery Point Suffix
Error correctionCheck character (top/bottom half values summed modulo 6)
Dimensionpostal

Where it is used

UK bulk mail (Cleanmail); also used unchanged by Singapore Post

People use it for uK bulk mail (Cleanmail); also used unchanged by Singapore Post.

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Example

SW1A1AA1A

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Related codes

Questions

What does the RM4SCC barcode on a letter contain?

RM4SCC turns a UK postcode plus delivery point suffix into a row of four-state bars. The cited standard is Royal Mail specification. The camera app does not scan this. The Zebra app does not scan this.

How is the RM4SCC check character calculated?

The check rule is: Check character (top/bottom half values summed modulo 6). When an app can scan the symbol, it returns the characters it read and does not label one of them as a check. The camera app does not scan this. The Zebra app does not scan this.

Is RM4SCC replaced by Mailmark?

RM4SCC turns a UK postcode plus delivery point suffix into a row of four-state bars. The cited standard is Royal Mail specification. The camera app does not scan this. The Zebra app does not scan this.