alt Hacker NewsBelgian National Number is your birth date, then an increment from 1 to 999 for every baby born that day, then a base-97 checksum.
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andruby • yesterday at 9:07 PM
Not sure if still the case: odd numbers for males and even numbers for females.
This also means a person’s Belgian RRN can change.
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Are there never more than 1k babies born in a day?