Check a number
Validate a Japanese corporate number or invoice registration number. Free, no account.
Check a corporate number (法人番号)Thirteen digits, with a check digit over the last twelve.Check an invoice registration number“T” plus thirteen digits. Sole traders are checked the same way.
Both run in your browser — the number you type is not sent anywhere. They tell you whether a number is well-formed, not whether it is registered. Only the register settles that.