The United States Postal Service (USPS)
publishes a database of all active addresses that they can deliver to, as well as
standards that reflect exactly how addresses should be written. The Coding Accuracy Support System (CASS)
reads your addresses and updates them to match these standards, correcting them where it can. The CASS systems we use
are certified by the USPS in order to guarantee their accuracy, and their databases are updated every 30 days. This
insures that we have the most up-to-date address information possible and that we can do the best possible job of cleaning
your address data.
Where CASS checks to see that a house number is in the appropriate range on a street, DPV
(Delivery Point Validation)
goes a step farther. It matches against an even larger database of every deliverable address in the United States.
Our systems compare your NCOA'd and CASS'd addresses against this database and remove any record that can't be delivered
for any reason, such as an empty lot or the building is known to be vacant.