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1. Preface
2. Introduction
4. Building and Residence Data Ports
5. Business and Organization Data Ports
6. City and Locality Data Ports
7. Country Data Ports
8. Customer Segmentation Data Ports
9. Enrichment Data Ports
10. Formatted Data Ports
11. Postal Carrier Certification Data Ports
12. Postcode Data Ports
13. Province and State Data Ports
14. Residual Data Ports
15. Street Data Ports
16. Supplementary Data Ports
17. XML Ports

# Delivery Point Check Digit

Output port that validates the ZIP+4 Code and Delivery Point Code (DPC) information in a United States address.
A check digit is single digit that is calculated using other digits in the same string. Address validation generates a delivery point check digit for all addresses with valid ZIP+4 Code and DPC information. When you add the digits in a ZIP+4 Code and DPC to the correct check digit, the sum is evenly divisible by ten. An automated mail system can use the delivery point check digit to verify that the ZIP+4 Code and DPC identify a valid United States address.
A delivery point is a unique mailbox recognized by the postal system. The United States Postal Service (USPS) assigns a two-digit DPC to every mailbox in a ZIP+4 Code area.
The USPS uses the combined digits of the ZIP+4 Code and the DPC to form barcode numbers.

## Delivery Point Check Digit Usage

Select Delivery Point Check Digit to enable an automated mail system to validate the ZIP+4, DPC, and barcode information in an address.

## Port Location

The following table provides the location and default precision of the Delivery Point Check Digit port:
Port Type
Port Group
Template Model
Precision
Output
US Specific
Basic
1

## Delivery Point Check Digit Output Codes

The following table shows a sample ZIP+4 Code, delivery point code, and check digit:
ZIP+4 Code
Delivery Point Code
Check Digit
12345-6789
01
4
The following calculation verifies that the ZIP+4 code and delivery point information identify a valid address:
```ZIP+4 Code = 123456789
Delivery Point Code = 01
Sum of digits 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 0 + 1 = 46