What does a Ukrainian tax number encode?

The first five digits are the number of days since 31 December 1899, giving the date of birth. The ninth digit encodes gender (odd = male, even = female) and the tenth is a check digit.

Does the checksum prove the person exists?

No. A valid check digit only shows the number is internally consistent. It does not confirm registration with the tax authority.

Is anything uploaded?

No. All decoding and validation happen locally in your browser.

Ukraine INN Validator

Decode a Ukrainian tax number (RNOKPP) — date, gender and checksum.

Ukrainian tax number (RNOKPP) validator

The Ukrainian RNOKPP (registration number of the taxpayer’s account card, also called the ІПН) is 10 digits. The first five encode the date of birth as the number of days since 31 December 1899, the ninth digit encodes gender, and the tenth is a weighted check digit.

Paste a number and this tool decodes the date of birth and gender and confirms the check digit — entirely in your browser, with nothing uploaded.