Japan Corporate Number & Invoice Check

法人番号・インボイス照会

This MCP server looks up Japanese companies by name or corporate number, and verifies whether qualified invoice registration numbers were valid on a specific date, using official open data published by the National Tax Agency of Japan (NTA). It can be used from AI assistants such as Claude and ChatGPT. Operated by SUGUKURU CO., LTD.

Features

Look up official corporate names, corporate numbers, and head office addresses from a company name or 13-digit corporate number (including whether corporate registry records are closed).
Verify whether a qualified invoice registration number ("T" followed by 13 digits) is registered, and whether it was registered on a specific date, such as a transaction date.
Validate corporate number check digits and normalize corporate name variations (without making external network queries).

Use cases

Verifying registration numbers on invoices (Accounting)
Onboarding and registering new business partners (Sales & Procurement)
Drafting contracts with a counterparty's official corporate name and head office address (Legal)
Verifying whether a Japanese company exists (International users)

Example prompts

"Was invoice registration number T1180301018771 valid on September 30, 2026?"
"Find the official name, corporate number and head office address of スグクル株式会社."
"Is corporate number 1180301018771 a registered Japanese company? Show its name and address."

How to connect

The endpoint URL is https://houjin.mcp.sugu-kuru.co.jp/mcp (no authentication required). In Claude, add this URL as a custom connector. To run the server in your own environment, use the npm package @sugukuru/mcp-houjin-bangou (see the GitHub README).

Important notes