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USPS Intelligent Mail Specification



USPS Intelligent Mail barcode is a height-modulated barcode that encodes up to 31-digits of mailpiece data into 65 vertical bars.

Encoding
USPS Intelligent Mail encodes a 31-digit string into 65 vertical bars each representing one of four possible states: full bar, ascender, tracker, and descender.




USPS Intelligent Mail will carry a data payload of 31 digits including the following elements:

Type Field Digits
Tracking Code Barcode Identifier 2 (2nd digit must be 0–4)
Service Type Identifier 3
Mailer Identifier 6 or 9
Serial Number 9 (when used with 6 digit Mailer ID)
6 (when used with 9 digit Mailer ID)
Routing Code Delivery Point ZIP Code 0, 5, 9, or 11
Total 31 maximum


For each of the fields above, except the Routing Code, leading or trailing zeros shall be provided to achieve the correct size. Spaces and nulls are not acceptable characters for padding. For ZIP Codes, which have one of four lengths, encoding shall provide padding beyond the digits to be encoded. No error detection and correction, such as a checksum with POSTNET or PLANET, shall be included as part of the data fields. Error detection and correction shall be added as part of the encoding process. The fields are described as follows:
  • The Barcode Identifier shall be assigned by USPS to encode the presort identification that is currently printed in human readable form on the optional endorsement line (OEL) as well as for future USPS use. This shall be two digits, with the second digit in the range of 0–4. The allowable encoding ranges shall be 00–04, 10–14, 20–24, 30–34, 40–44, 50–54, 60–64, 70–74, 80–84, and 90–94. The list of valid field values is provided in Appendix A.
  • The Service Type Identifier shall be assigned by USPS for any combination of services requested on the mailpiece. The allowable encoding range shall be 000–999. Each 3-digit value shall correspond to a particular mail class with a particular combination of service(s). Each service program, such as OneCode Confirm and OneCode ACS, shall provide the list of Service Type Identifier values. The list of valid field values when no services are requested is provided in Appendix A.
  • The Mailer or Customer Identifier shall be assigned by USPS as a unique, 6 or 9 digit number that identifies a business entity. The allowable encoding range for the 6 digit Mailer ID shall be 000000- 899999, while the allowable encoding range for the 9 digit Mailer ID shall be 900000000-999999999.
  • The Serial or Sequence Number shall be assigned by the mailer for uniquely identifying and tracking mailpieces. The allowable encoding range shall be 000000000–999999999 when used with a 6 digit Mailer ID and 000000-999999 when used with a 9 digit Mailer ID.
  • The Delivery Point ZIP Code shall be assigned by the mailer for routing the mailpiece. This shall replace POSTNET for routing the mailpiece to its final delivery point. The length may be 0, 5, 9, or 11 digits. The allowable encoding ranges shall be no ZIP Code, 00000–99999, 000000000–999999999, and 00000000000–99999999999.


USPS Intelligent Mail data examples
20 digit length: 04370365154032589210
25 digit length: 0437036515403258921034567
29 digit length: 04370365154032589210345671234
31 digit length: 0437036515403258921034567123456


USPS Intelligent Mail Properties
Besides the properties to general barcode, the following properties belongs to USPS Intelligent Mail:

PostnetHeightTall gets or sets tall bar height for Postnet, Planet or USPS Intelligent Mail. Default is 0.127 inch.
PostnetHeightShort gets or sets short bar height for Postnet, Planet or USPS Intelligent Mail. Default is 0.05 inch.
PostnetSpacing gets or sets space the for Postnet, Planet or USPS Intelligent Mail. Default is 0.026 inch.





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