Royal Mail
Courier & ShippingAlso known as: RM4SCC
Ethan Carter
QR & Barcode Standards Specialist
Royal Mail RM4SCC (the 4-state customer code) encodes UK postcodes for automated mail sorting.
How it works
Each bar takes one of four states using ascenders and descenders, encoding the postcode plus a checksum.
Where it's used
UK postal automation and discounted mailsort services.