United States Postal Service (USPS) uses a computer cipher language called Postal Numeric Encoding Technique also known as POSTNET to assist it in delivering the mails easily and quickly. This technique was developed by the U.S. post offices to encode the zip code information of various places thus improving the accuracy and speed in delivering the mails. Many post offices of the United States offer huge discounts for sending mails that are having these conventions.
Basically there are four formats of the labels that are used by the U.S. postal services. The initial one is the normal zip information of the place which is usually a five digit cipher. This is also referred as the code-A. The second format is a six digit convention that contains the last two digits of the zip info and the four digits of the zip+4 labels. This is also known as code-B. During the initial days of mail processing through these conventions this label was found only in those mails that have a five digit label which is the zip code so that they can upgrade the mail.
The next format is known as code-C which is a nine digit cipher that contains the five digit zip info and zip+4 code making a total of 52 bars. The main purpose of this nine digits cipher is to sort out the mails to the individual delivery carriers of the destination places. The last format is also called as delivery point bar code which is an eleven digit convention that contains the five digit zip info, zip+4 digits and the delivery point label making a total of 62 bars. This format is widely used by all the post offices in the present days.
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