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 CASS or the Coding Accuracy Support System was developed by the USPS® to evaluate the accuracy of address-matching software programs. For a product to be CASS Certified™, it has to obtain a minimum score of 98.5% correction accuracy for ®, Carrier Route, five-digit and LACSLink®
and 100% for Delivery Point coding, DPV®, and RDI™. The CDYNE
Postal Address
Verification API is CASS Certified in the following areas:
Five-digit coding
Five-digit coding validates existing five-digit zip codes.
ZIP + 4/ Delivery Point (DP) coding
Delivery Point (DP) is a single mailbox or location where mail is delivered, and is assigned a two-digit number between 00 and 99 by the USPS. The combination of a DP number and Zip + 4 code provides a unique identifier for every deliverable address.
Delivery Point digits are encoded in the POSTNET delivery point barcode (DPBC) or as part of the
Intelligent Mail Barcode (IMB), both of which are used for USPS automation discounts.
Carrier Route coding
Postal mail containing carrier route codes can be presorted to the carrier route level to take advantage of presort postage discounts.
DPV
A validation process that confirms the existence of a specific address (down to the apartment or suite number) and the fact that it can be delivered to. DPV checks for one of the following scenarios:
- The address has the correct primary and secondary data
- The address has the correct primary but not secondary data
- The address cannot be validated
LACSLink
A system that matches addresses against a list of rural route, highway route, and box number addresses that have been renumbered or renamed due to 911 address conversions. These conversions involve changing rural-style addresses to city-style addresses for 911 emergency system implementations.
RDI™
Residential Delivery Indicator identifies whether an address is classified as residential or business. Avoid residential delivery surcharges by verifying delivery type status prior to shipping, and identify shipping patterns to improve operational efficiency.
SuiteLink
Provides improved business addressing information by appending known secondary (suite) information to business addresses.
< Back to the CDYNE
Postal Address Verification API
The following trademarks are owned by the United States Postal Service®: CASS, CASS Certified, DPV, First-Class Mail, LACSLink, Post Office, Postal Service, Standard Mail, U.S. Postal Service, United States Post Office, United States Postal Service, USPS, ZIP, ZIP Code, and ZIP + 4.
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