trying to see how far the next customers ssn is and trying to derive a way to know how SSN is assighned) I know its stupid.
Not entirely.... Using a known first three numbers of an SSN reveals the following:-

The Social Security Number XXX-82-8725
is valid and was issued in North Carolina.
This SSN is ACTIVE.

Would you like to learn more about this SSN?........
I hid the first three because they are mine.... the rest was a random selection.... I landed in Charlotte, NC in 1989 entering the country for the first time as a "Resident Alien"... Funny how my SSN indicates that.... wonder what else is in there.... The second pair is probably significant too....

PS: "Active" means I'm not dead yet..... Which is a relief... I check it every morning at 0530 before I have my coffee.....