The USPS Postal Alpha Numeric Encoding Technique (PLANET) symbology was developed by the United States Postal Service (USPS) to identify, sort, and track pieces of mail automatically. It was typically used in conjunction with the USPS Postal Numeric Encoding Technique (USPS POSTNET) symbology.

In 2009, POSTNET was superseded by the USPS Intelligent Mail barcode (IMb), and PLANET was superseded by IMb in 2013.

The USPS offers a subscription service to mailers, called Confirm, that enhances the mail tracking process. PLANET is one component of the Confirm system. Two service types are available: Destination Confirm (which generates mail processing data for outgoing mail) and Origin Confirm (which generates data for incoming reply mail). Mailers can use one or both service types.

PLANET is defined in USPS Publication 197 Confirm Service Featuring OneCode Confirm.

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