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What is CASS Certified Address Validation?

The CASS™ software certification program from the USPS provides hardware and software developers, service bureaus, and commercial mailers a common measure by which to test the quality of address-matching software. Software tests for CASS™ certification are graded by the U.S. Postal Service Addressing and Geospatial Technology (AGT) office and the results are returned to the developer to provide useful diagnostics for correcting software deficiencies. 

CASS™ enables the Postal Service™ to evaluate the accuracy of address matching software programs in the following areas.

  • 5-digit coding
  • ZIP + 4/ delivery point (DP) coding
  • Carrier route coding
  • DPV® or DSF
  • LACSLink®
  • SuiteLink®
  • eLOT®
  • RDI™

CASS™ allows developers, vendors, and mailers the opportunity to test their address-matching software packages, and after achieving a specified percentage of compliance to be certified by the Postal Service. CASS™ enables mailers to measure and diagnose commercially available address-matching software packages.

The following AccuZIP applications are CASS™ Cycle O Certified:

You are a genius and I have no excuse for not thinking of this before calling. Our customer is good with cutting the tops and bottoms for the booklets to get under 16 ounces. Thank you for getting me out of a jam and thank you even more for offering your help with this project! I decided to switch to AccuZIP after speaking with Steve at the Minuteman Show. I was impressed with his idea of customer service and you have totally proven him right.
M.M., Petaluma, CA