. • https://www.oecd.org/content/dam/oecd/en/topics/policy-issue-focus/aeoi/romania-tin.pdf Slovakia “Rodné číslo” (RC)-(birth identification number) is a unique personal identifier assigned to every Slovak citizen (and some residents). The rodné číslo is a 10-digit personal identifier in the format YYMMDD/XXXX, where the date of birth is encoded.