For Taiwanese nationals, ID numbers are created based upon specifics about their life, for example:
The first capital letter represents the initial household registration of the person, e.g. A for Taipei.
The first number, which is after the capital letter is either a 1 or a 2 which means male or female.
However, since the ID number given to foreigners has two capital letters, and the number after the letters can be something other than a 1 or a 2, the same principles cannot be used to work out details. Does anybody know what kind of formula or calculation is used to create ID numbers for foreigners?
Iāve had that problem, but itās usually because the staff member didnāt know how to deal with the foreigners ID, for example they will try to enter it in to a field that only accepts Taiwanese ID numbers, but when Iāve explained to them that the ID numbers donāt use the same structure and they need to get to the alien resident certificate holder page/form on their system, they usually ask their boss for help which solves the problem. If you know what to say in Chinese itās a non-issue imo.
Here is a translation of the Chinese version for anyone else who is interested.
ARC ID numbers have two capital letters, the first is the household district where they originally registered, and the second represents gender. For Chinese, Hong Kong and Macau citizens, A means male, and B means female, but for every other foreigner, C means male, and D means female.
The only difference between ARC and Taiwan ID numbers is that the second character which represents gender is a letter instead of a number, A or C meaning male, and C or D meaning female.
Very interesting to finally understand that system. I had a couple of āDouble Dā friends in Tainan . I always assumed every other ARC number started with DC, not at all, Iām special (čŗåļ¼ē·ē)ļ¼