What do the digits in the PLANET code represent?
The first two digits indicate the type of PLANET code and the size and class of the mail piece. Destination, outgoing PLANET codes start with a number from 40-45. Origin, incoming PLANET codes start 50-55. The next 5 digits are the account number assigned to trackmymail.com by the Postal Service. The next four digits are the numbers we use to identify a particular mailing, and the last digit is a “correction” digit. The sum of all digits must end with “0”. The correction digit makes certain that this happens.
