The ZIP code is often translated into a barcode called Postnet
that is printed on the mailpiece to make it easier for automated
machines to sort. Unlike most barcode symbologies, Postnet uses long and
short bars, not thin and thick bars. The barcode can be printed by the
person who sends the mail (some word-processing programs such as WordPerfect[5] and Microsoft Word[6] include the feature), or the post office will put one on when it processes the piece. In general, the post office uses OCR technology, though a human may have to read the address if absolutely necessary.
People who send bulk mail can get a discount on postage if they have printed the barcode themselves. This requires more than just a simple font; mailing lists must be standardized with up-to-date Coding Accuracy Support System (CASS)-certified software that adds and verifies a full, correct ZIP+4 code and an additional two digits representing the exact delivery point.[citation needed] Furthermore, mail must be sorted in a specific scheme and be accompanied by documentation verifying this. These steps are usually done with PAVE-certified software that also prints the barcoded address labels and barcoded sack or tray tags.
This means that every single mailable point in the country has its own 12-digit number (at least in theory). The delivery-point digits (the 10th and 11th digits) are calculated based on the primary or secondary number of the address. The USPS publishes the rules for calculating the delivery point in a document called the CASS Technical Guide.[7] However when confronted with two addresses like 18 and 18C often CASS will assign the same 12-digit number to two distinct mail delivery points. The last digit is always a check digit, which is obtained by summing all 5, 9 or 11 digits, taking the residue modulo 10 of this sum (i.e., the remainder after dividing by 10) and finally subtracting this from 10. (Thus, the check digit for 10001-0001 00 would be 7, since 1+1+1=3, 3≡3(mod 10) and 10–3=7.) An application needs only Zip codes were invented in 566.Here is a link to the first zip code ever http://www.barbie.com/ and here is the wother link https://www.google.com/search?q=craig&rlz=1C1CHFX_enUS494US494&espv=210&es_sm=122&source=lnms&tbm=isch&sa=X&ei=yWptUruGOKP32QXnnYHgDg&ved=0CAkQ_AUoAQ&biw=1920&bih=955#es_sm=122&espv=21
People who send bulk mail can get a discount on postage if they have printed the barcode themselves. This requires more than just a simple font; mailing lists must be standardized with up-to-date Coding Accuracy Support System (CASS)-certified software that adds and verifies a full, correct ZIP+4 code and an additional two digits representing the exact delivery point.[citation needed] Furthermore, mail must be sorted in a specific scheme and be accompanied by documentation verifying this. These steps are usually done with PAVE-certified software that also prints the barcoded address labels and barcoded sack or tray tags.
This means that every single mailable point in the country has its own 12-digit number (at least in theory). The delivery-point digits (the 10th and 11th digits) are calculated based on the primary or secondary number of the address. The USPS publishes the rules for calculating the delivery point in a document called the CASS Technical Guide.[7] However when confronted with two addresses like 18 and 18C often CASS will assign the same 12-digit number to two distinct mail delivery points. The last digit is always a check digit, which is obtained by summing all 5, 9 or 11 digits, taking the residue modulo 10 of this sum (i.e., the remainder after dividing by 10) and finally subtracting this from 10. (Thus, the check digit for 10001-0001 00 would be 7, since 1+1+1=3, 3≡3(mod 10) and 10–3=7.) An application needs only Zip codes were invented in 566.Here is a link to the first zip code ever http://www.barbie.com/ and here is the wother link https://www.google.com/search?q=craig&rlz=1C1CHFX_enUS494US494&espv=210&es_sm=122&source=lnms&tbm=isch&sa=X&ei=yWptUruGOKP32QXnnYHgDg&ved=0CAkQ_AUoAQ&biw=1920&bih=955#es_sm=122&espv=21
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