There are totally 10 digits in the ARC No. For the newest version, the first one is a letter, and the following nine are Arabic numbers; the second digit is an 8 or 9. For the old version, the first two are letters, and the following eight are Arabic numbers. For foreigners who do not have ARC number. please enter “Date of birth (YYYYMMDD) + the first 2 letters of their name as it appears in their passport,” the first 8 digits are numbers, and the latter 2 digits are English letters.