The Coding Accuracy Support System (CASS™) is a United States Postal Service® (USPS®) program that certifies the accuracy of address validation software. To qualify for certain postal discounts you must use software that is CASS Certified™ to assign ZIP Code™, ZIP + 4® codes, and delivery point barcodes to mail.
Makers of address validation software must pass a test designed by the USPS in order to have their software designated as CASS Certified™. CASS Certified™ software must pass tests of accuracy in the following areas:
- Five-digit coding
- ZIP + 4®/delivery point (DP) coding
- Carrier route coding
- Delivery Point Validation (DPV®)
- Locatable Address Conversion System (LACSLink®)
- Enhanced Line of Travel (eLOT®)
- Residential Delivery Indicator (RDI™)
When you use a CASS Certified™ product, you are assured of the following minimum levels of accuracy:
|
Certification Level |
Required Accuracy Level |
|---|---|
|
ZIP |
98.5% |
|
Carrier Route |
98.5% |
|
ZIP+4 |
98.5% |
|
Delivery Point Barcode |
100% |
|
eLOT |
100% |
|
Perfect Addresses |
100% |