---
title: "Changes to Japan Postal Codes"
date: "2019-12-11"
source: "https://7e33ee16.dev-site-4ua.pages.dev/minfraud/release-notes/2019-12-11-changes-to-japan-postal-codes/"
---

# Changes to Japan Postal Codes

_December 11, 2019_

> **⚠️ Warning**
>
> This release note is more than two years old and may no longer reflect
> current behavior. View the
> [latest release notes](/minfraud/release-notes/index.md).

Effective December 16, 2019, we will return `1` as the last digit for all 7
digit postal codes in Japan. The last digit refers to
[street-level resolution](https://en.wikipedia.org/wiki/Postal_codes_in_Japan)
and should not be relied upon for IP geolocation.