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I think they're used as placeholders while they file the documents. My OG SS number started with 950, but that only lasted until the paperwork was complete.
Obviously I won't be sharing my private info here though, but yeah, those numbers can't officially start with a 9.
There are several more that aren't used. There are a few reserved for promotions or movies and such. 666, 900-999 and 000 numbers are out as well.
I believe that SSNs have to pass a luhn check too.
But that would mean there's already duplicates in use as you'd be limited to 90 million rather than 900 million.
https://en.m.wikipedia.org/wiki/Social_Security_number#Valid_SSNs
https://www.investopedia.com/terms/l/luhn-algorithm.asp#:~:text=The%20Luhn%20algorithm%20is%20used%20to%20check%20or%20validate%20identification,was%20input%20and%20processed%20accurately.
More info there.
From the first link.
From the second.
Yeah, personally, I have questions about the luhn check myself. (I am not in a state to research more this evening, unfortunately.)
I'll save you the bother. It doesn't have one. :)
If it did, there wouldn't be enough numbers for everyone to have a unique one.