The Address – Postal Code (DAK) field in the bar code is defined as 11 characters. How should this field be filled when using a five digit or a nine digit US ZIP code?
Regardless of the number of characters known for the ZIP code, the field should be left justified and no hyphen should be used. If only the first five characters of the ZIP code are available, then add four zeroes at the end to make the total length nine characters and then add two blanks at the end. An example of what this might look like is “54321000bb “. For a nine digit ZIP code, use the ZIP code and then add two blanks at end. An example of this would look like “987654321bb”.
