Computer Delivery Sequencing (CDS) 

The Computerized Delivery Sequence (CDS) File is a 5-digit ZIP Code-based, electronic customer product that provides and updates delivery sequence address information by carrier route for qualified mailers. Mailers must initially qualify for CDS information through the procedures described in the Domestic Mail Manual (DMM^®), Module A, Section 920.

When a mailer initially qualifies, delivery sequence address information for the 5-digit ZIP Code areas for which the mailer has qualified is made available via electronic media.