Automated Zone Indicator (AZI) Table

The AZI table lists each five-digit ZIP Code™ and is an indicator of the type of processing that typically takes place on letter mail destined for each ZIP Code. Each number in the file is a ZIP Code appended with a numeric zone indicator. The five numeric indicators are as follows:

1. Two Pass Zones: Automated two-step sector/segment at mail processing facilities
2. 876 Carrier Route Sort Zones: Automated incoming secondary carrier route sorting at plants
3. Carrier Route Barcode Sorter (CSBCS) Zones: Automated walk sequence sorting on CSBCS machines at delivery units
4. Delivery Barcode Sorter (DBCS) Zones: Automated walk sequence sorting on DBCS machines at plants [i.e., sectional center facilities (SCFs)] or at delivery units
5. Manual/Mechanized Zones: No automated sorting; no tracking code scans should be generated from facilities matched to these ZIP Codes

Informed Visibility® Mail Tracking & Reporting (IV®-MTR) Operation Codes List

This spreadsheet provides a list of operation codes (opcodes), also known as Scan Event Codes, for the IV-MTR application.

Package Entry Time by Facility

PTR Domestic Scan Events and Descriptions

May 2025 Nixie Volume

This spreadsheet contains the UAA statistics for May 2025.

2025 ZIP Code™ Split Listing (ZIPSPLIT) (Effective 7/01/2025)

April 2025 Nixie Volume

This spreadsheet contains the UAA statistics for April 2025.

Undeliverable-as-Addressed (UAA) Statistics by Mailing Industry Quarterly Report (Q2 FY25)

ACS Nixie stats by industry for FY25 Q2.

March 2025 Nixie Volume

This spreadsheet contains the UAA statistics for March 2025.

NCOALink® Statistics

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