[Prior Notice] About the change of CSV format of Choji data in the renewal of the base registry for address system

Published: November 13, 2026

1. Overview

In base registry for address, the system renewal is scheduled for the end of January 2027. With this system renewal, we will change the CSV format of the Machi-aza data.

This notice is intended to inform you of some of the changes in advance. The details of the specific changes will be announced around December 2026.

2. Target Data

• Choji Data (CSV Format)

There is a possibility that each of the data of Residence Indication - Address, Residence Indication - Block, and Lot Number may be changed due to the change of the Choji data.

3. Date of Change

• Late January 2027 (planned). This will be implemented when the system is updated.

We are considering allowing current users to obtain data in the current format for a certain period of time. However, please note that data added or updated after the system update will be provided only in the new format and will not be provided in the current format.

4. Details of the Changes

• The details of the changes (a sample of the Machiji data after the change (CSV format), etc.) will be released around December 2026.

5. Request to Users

• For the system used by incorporating Machi-ji data, etc., there is a possibility that renovation and setting changes will be required due to the changes this time.
• The internal processing of the ABR Geocoder (GitHub) will also change, so the ABR Geocoder will also need to be updated to the new version. In addition, since the API definition will also change, there is a possibility that the system using the ABR Geocoder will need to be addressed.
• Please consider the timing of renovation and verification in advance in anticipation of the change in late January 2027 (scheduled).

6. Future Schedule