Belgian National Number is your birth date, then an increment from 1 to 999 for every baby born that day, then a base-97 checksum.
replyNot sure if still the case: odd numbers for males and even numbers for females.
replyThis also means a person’s Belgian RRN can change.
Yep, but they do not change on sex change, IIRC.
replyI wrote a system for a medical lab decades ago and IIRC I did actually have to change some RRN's manually. It's been a while so I'm not 100% sure, but I do think the changes were due to switching gender.
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