![]() If the scanner can't read the address, the letter is manually sorted. An optical scanner scans the address, and then a bar code representing the specific address is sprayed on the front of the envelope. Your letter gets its postmark, and machines print cancellation lines across postage stamps to prevent them from being reused.Ī unique bar code is imprinted on the back of each piece of mail. They also orient the packages so their addresses are right-side up and facing the same direction. There, all of the mail is placed on a truck and taken to a mail processing plant.Īt the mail processing plant, machines separate mail by shape and size. The 5 digit zip code most commonly indicates a destination post office.Ī postal carrier collects your letter from the box along with the rest of the mail and takes it to the post office. p. 13.USPS five-digit zip codes are the zip codes you are familiar with. The Postal Service is promoting use of the Intelligent Mail barcode because it expands the ability to track individual mailpieces and provides customers with greater visibility into the mailstream. The Intelligent Mail barcode, formerly referred to as the 4-State Customer barcode, is a new Postal Service barcode used to sort and track letters and flats. ^ "Intelligent Mail Services Latest News" (PDF).^ a b "Intelligent Mail Barcode 4-State Specification (Rev H)" (PDF).The number of characters can be calculated from the binomial coefficient. The characters are interleaved throughout the symbol. Consequently, single-bit errors in a character can be detected (toggling one bit results in an invalid character). The Hamming distance between characters is at least 2. Each character has 2, 5, 8, or 11 of its 13 bits set to one. The 65 bars represent 130 bits (or 39.13 decimal digits), grouped as ten 13-bit characters. Each bar contains the central "tracker" portion, and may contain an ascender, descender, neither, or both (a "full bar"). The code is made up of four distinct symbols, which is why it was once referred to as the 4-State Customer Barcode. The Intelligent Mail barcode is a height-modulated barcode that encodes up to 31 decimal digits of mail-piece data into 65 vertical bars. The four types of symbols in an Intelligent Mail barcode. Use of the barcode provides increased overall efficiency, including improved deliverability, and new services. The barcode is applied by the sender the Postal Service required use of the Intelligent Mail barcode to qualify for automation prices beginning January 28, 2013. It effectively incorporates the routing ZIP code and tracking information included in previously used postal barcode standards. ![]() The complete specification can be found in USPS Document USPS-B-3200. ![]() An Intelligent Mail barcode has also been referred to as a One Code Solution and a 4-State Customer Barcode, abbreviated 4CB, 4-CB or USPS4CB. The IM barcode is intended to provide greater information and functionality than its predecessors POSTNET and PLANET. ![]() The term "Intelligent Mail" refers to services offered by the United States Postal Service for domestic mail delivery. The Intelligent Mail Barcode ( IMb) is a 65-bar barcode for use on mail in the United States. A possible Intelligent Mail Barcode for the Wikimedia Foundation address
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