CASS Certified Software and Services

CASS™ otherwise known as Coding Accuracy Support System was developed by the United States Post Office® to enable the USPS to evaluate the accuracy of address verification or validation software and services.

For a product to be 'CASS Certified', it has to obtain a minimum score of 98.5% correction accuracy as tested by the USPS with 150,000 sample postal addresses. To remain CASS certified, software developers must retest annually.

This certification does four main things:

1. Assigns ZIP+4 and DP utilizing DPV
2. Provides standardization of addresses
3. Utilizes USPS data and appends carrier route
4. Indicates whether or not a Zip Code contains PO boxes only

CASS evaluates software in a minimum of six different areas as listed below.

1. Five digit coding ability
2. ZIP + 4 Delivery point (DP)
3. Carrier route coding
4. DPV™ (Delivery Point Validation)
5. DSF2™ (Delivery Sequence File)
6. LACSLink™

DPV- Delivery Point Validation is a database maintained by the USPS cross-referenced by CDYNE Address Verification to ensure that an address is deliverable. The address can be a standard address in the USPS database and a vailid address, but if it does not reside in the DPV database, it is not deliverable by the USPS.

DSF2- The USPS Delivery Sequence File is utilized to obtain accurate delivery information and facilitates identification of erroneous address.

LACSLink - This has been a requirement as of August 2007. LACSLink is a database updated by the USPS that will correct addresses that have been converted due to changes in emergency services or USPS policies. This database ensures addresses affected will not become UAA. (Undeliverable As Addressed)

The post office goes out of their way with CASS to make sure software companies are providing the very best quality address verification products. Please make sure you are using CASS Certified software or services.

Read about the CDYNE Read about the CDYNE Postal Address Verification Web Service that makes it easy to implement address correction and more into any application currently in use by your organization.