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The RDI™ Product allows customers to determine whether an address is classified as residential or business in the USPS® Address Management System (AMS) database. Addresses processed using the RDI data return an indicator denoting ‘Yes’ for Business or ‘No’ for Residential.

The RDI Product should be used in conjunction with CASS Certified™ ZIP + 4® address matching software and may be used on any platform. Product updates are provided on a monthly basis.

The RDI data is supplied as hash tables. The standard hash algorithm is only determined for the 9-digit and 11-digit ZIP Code rather than the entire address. The 9-digit hash table consists of ZIP + 4 codes that contain only business deliveries. The 11-digit table consists of the delivery point codes for the business deliveries where the ZIP + 4 code contain both business and residential deliveries.

The RDI Product can be used for internal purposes or provided as service to third parties. Additionally, the RDI data can also be redistributed to third parties.

Annual License Fee: $365.00*

To develop RDI-enabled software, you should be or in the process of becoming a CASS software manufacturer. If interested in becoming a CASS software manufacturer, contact the CASS™/MASS™ Department at 800-642-2914.

For more information on AIS Products, please contact Customer Care at 800-238-3150. For a copy of the AIS Products Order Form, go to https://ribbs.usps.gov/add

Contact Information:

  • RDI
  • Phone: 800-238-3150
  • Email: incsc@usps.gov
  • Page updated: 01/27/2014

Important Updates

Standard Mail DSCF Load Leveling Final Rule Published in the Federal Register

The Postal Service has released its Federal Register final rule revising the service standards for Standard Mail that is eligible for Destination Sectional Center Facility (DSCF) rates. These changes will allow a more balanced distribution of DSCF Standard Mail across delivery days. With its new rules, USPS is extending delivery expectation to four days for mail entered on Friday and Saturday. National Implementation began April 10, 2014.

January 2014 Price Change Fact Sheets

Getting Started with Full-Service Intelligent Mail

PostalOne! Contingency Plan

For mailers unable to submit electronic information, click here for the PostalOne! Contingency Plan.


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