On a job application site for my local government it reveals if a specific social security has been used or not on that site. The site is very outdated.
this post was submitted on 07 Dec 2025
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Here is a reminder for all US citizens.
Your social security number is simply a serial number with zero checksums or any logic built in.
If you want another valid social security number you can simply pick a number before or after your own.
The social security number was never designed to be a general ID number, and should not be used as such.
If you’d like this information told more wittily, watch CGPGrey’s video “Your Social Security Card is Insecure” (7:49).
We have our birthday and 4 not so random numbers at least. Also one of the numbers say if you are man or female.
Here in Sweden the personal number starts with your birthday, then a serial number and finally a checksum that also indicates your gender.
If you have an even checksum digit, that indicates that you are a woman, if you have an odd checksum digit, that indicates that you are a man.
Here you can find more information: https://en.wikipedia.org/wiki/Personal_identity_number_(Sweden)
Looks similar to Belgium.
Here it starts with your birth date, a serial number that specifies your gender (even for women, uneven for men) and a checksum.