About this API
Houjin Bangou is Japan's 13-digit corporate number, assigned to every entity. The NTA (National Tax Agency) maintains the official register of all numbers together with basic entity data — name and address. It is the foundation of company identification in Japan, complementary to gBizINFO.
Frequently asked questions
Do I need an API key?
Yes — it requires a free application ID (free request to the NTA).
What data does this API return?
Basic data for a Japanese entity by corporate number — name, address and registration status.
Can this API be called directly from a browser?
Not easily — key/registration-based authentication requires a server-side call and is not suitable for frontend code visible to visitors (which is why there is no live "Try it" button here).
Who runs this API?
NTA (Japan's National Tax Agency). Documentation: houjin-bangou.nta.go.jp.