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CASSCertify.com provides CASS™ processed addresses for your mailing list via the Internet quickly, easy and cost effectively. Our CASS™ processing on-line service includes ZIP Code™ correction and assignment of ZIP + 4® codes, carrier route, delivery point, eLOT™ code and the ZIP® 4 Error Code for those addresses that do not meet CASS™ processing requirements.

Once completed, your file will be returned to you along with the CASS™ Report (Postal Service™ Form 3553) and the new file layout. You will receive the file via email.

CASSCertify.com is a non-exclusive Limited Service Provider Licensee of the United States Postal Service®. The following trademarks are owned by the United States Postal Service: CASS, CASS Certified, NCOALink, ZIP, ZIP + 4, ZIP Code, eLOT, Postal Service, USPS, and United States Postal Service.

All lists submitted via the website must be provided in ASCII (delimited) or ASCII (fixed) format.

Files that must be compressed or are executable such as .zip or .exe must be submitted via email to info@casscertify.com. A file layout must be included.


Your file layout
doesn't match ours?

No Problem!

We accommodate to your needs!

All you have to do is provide us with an accurate description for the following fields when completing the upload form:

Custom Layout Mandatory Field Requirements

  • Primary Address Line
  • Secondary Address Line (optional)
  • City
  • State
  • Zip Code


IMPORTANT: You must provide correct file layout information to insure proper address correction. For ASCII (comma delimited) files please indicate the relative field location number for all mandatory fields. For ASCII (fixed) files you must provide the starting position and field length of all mandatory fields as well as the total overall field length.

Additional fields may be included in both ASCII Fixed and ASCII Delimited file formats. This data will be carried forward to the output file with the CASS certified data being appended to the end of the record.



 The CASS Certification Process

As your file is processed, www.casscertify.com will append normalized address information, as well as the carrier route, delivery point, and LOT code, to all standardized records.

The following standardized address information will be appended to your original record: (numbers in parenthesis define a fixed length field layout).
  • Normalized Address Line (60)
  • Normalized City (25)
  • Normalized State (2)
  • Normalized 5-digit Zip (5)
  • Normalized Zip+4 (4)
  • Carrier Route (4)
  • Zip Delivery Point (3)
  • ELOT) (5)
  • Error Code (2)


If an address is not fully standardized, the input address will not be changed and will be returned exactly as received. In addition, we will provide you with an error code to indicate why that record was not able to CASS certify.

 Error codes
Code Reason
10 Invalid Dual Address
11 Invalid City/State/Zip
12 Invalid State
13 Invalid City
21 Address Not Found
22 Multiple Response
31 Exact Match
32 Default Match
41 Exact Match with Extra Data
42 Default with Extra Data
49 Advanced Clean Up
99 System Error Code

Once completed, your file will be returned to you along with the CASS certification report (Postal Service Form 3553) and the new file layout. You will receive the file via email.

For information on becoming a test site, or if you have further questions about pricing, email us at: info@casscertify.com or at info@casscertify.com.















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