You can find it on: Lithuanian ID card or passport Birth certificate Official government documents Tax or social security documents • https://www.oecd.org/content/dam/oecd/en/topics/policy-issue-focus/aeoi/lithuania-tin.pdf • http://www.vmi.lt/ Luxembourg National Identification Number (Matricule) or Individual National Identifier (NI) or Numéro d'identification national Digits: 13-digit Format: 1234567890123. This is the format of the Matricule.