Address Validator Port Reference

10.5
- 10.5.7
- 10.5.6
- 10.5.4
- 10.4.0

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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
Add check digit +4
Equals 50
Divide 50 by 10 = 5 with no remainder

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Table of Contents

Address Validator Port Reference

Address Validator Port Reference

Delivery Point Check Digit

Delivery Point Check Digit

Delivery Point Check Digit Usage

Port Location

Delivery Point Check Digit Output Codes