Technical Specifications
11/28/2025
NCOA API Specifications
FAQs
11/28/2025
Modernization of Address & NCOA Processing with APIs - Q & A
Data Files
11/28/2025
NCOALink® Statistics

This spreadsheet includes NCOALink statistics from 2007-2024 by licensee type.

Data Files
11/28/2025
Z4 Info File

A downloadable ZIP file containing information related to the Z4 Info File

Data Files
11/28/2025
Early Warning System (EWS002C0.ZIP)

This file is the EWS production file and is updated weekly. This file contains the Early Warning System data file for the CASS™ and MASS™ certification process.

 

Release Notes
11/26/2025
January 4 2026 Release Notes
Program Requirements
11/26/2025
INFORMATIONAL - International Suspension of Mail Service - Effective November 28, 2025
Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML TEM WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ TEM Release 63.0.0.0

Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML PrePROD WSDLs
Tech Guides
11/26/2025
PostalOne! Release 63.0.0.0 Mail.XML PROD WSDLs

This ZIP file contains the Web Services Description Language (WSDL) and XML Schema Definition (XSD) files for Mail.XML™ PROD Release 63.0.0.0