CASS Study Guide 2026
Everything you need to pass the CASS exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CASS Exam Format at a Glance
📚 CASS Topics to Study (69)
✍️ Sample CASS Questions & Answers
1. A CASS-certified software system processes a batch of addresses and returns a DPV confirmation code of 'S'. What does this mean?
DPV code 'S' indicates the primary address matched but the secondary component (such as an apartment number) did not confirm.
2. Which legacy USPS barcodes did the Intelligent Mail barcode replace?
The IMb was designed to replace and consolidate the older POSTNET (routing) and PLANET (tracking) barcodes into a single, more capable barcode.
3. In the context of CASS certification, what is the most important consideration when implementing address hygiene & data quality?
When implementing address hygiene & data quality, CASS professionals must ensure alignment with industry standards and stakeholder needs. Hasty implementation without proper planning often leads to compliance issues and suboptimal outcomes.
4. Which Move Update method requires mailers to match their address lists against the National Change of Address Linkage database?
NCOALink is the USPS-licensed product that allows mailers to match their address files against up to 48 months of change-of-address records to satisfy Move Update requirements.
5. Which of the following best describes 'LACSLink' as it relates to CASS processing?
LACSLink converts old-style rural route addresses to new city-style addresses resulting from the E-911 addressing systems.
6. What is the maximum elapsed time between a CASS certification cycle's start date and the date a mailer must reprocess a mailing list to maintain currency?
USPS requires that address lists be processed through CASS-certified software within 180 days of the mailing date to qualify for automation discounts.