About Japan Post Barcodes
The Japan Post barcode is a 4-state postal barcode used in Japan for sorting letters and packages. Introduced by Japan Post, it encodes the Japanese 7-digit postal code (zip code) and subsequent address details (like block and house numbers), allowing mail sorting machines to route mail to the correct carrier route.
How Japan Post Encoding Works
The barcode is a 4-state code utilizing Tracker, Ascender, Descender, and Full Bar elements. It consists of a start code, 20 data characters, a check digit, and a stop code. The data characters encode digits (0-9) and letters (A-Z) representing the address. Address characters are extracted from the text using specific abbreviation and formatting rules before encoding.
Common Applications and Industries
Japan Post barcodes are printed on business mailings, billing statements, invoices, and direct mail within Japan. Japanese organizations print them to receive postage discounts. Sorting centers scan the barcode to automate delivery routing, which helps manage the high volume of domestic mail in metropolitan areas like Tokyo.
Advantages & Limitations
It encodes both zip codes and Japanese address details in a compact format, facilitating precise postal sorting. The 4-state vertical layout fits neatly onto the margins of envelopes and packages. The limitation is that it is highly specialized for Japanese address structures and is not compatible with international postal systems.