[Novalug] [OT] SSN use
Jon LaBadie
novalugml@jgcomp.com
Mon Sep 7 17:33:14 EDT 2009
On Mon, Sep 07, 2009 at 04:55:52PM -0400, Richard Rognlie wrote:
> I can impart some knowledge of SSNs and validation checked.
>
> your SSN consists of 3 parts: Region (first 3), Group (middle) and
> whatever they call the Rest (last 4)
>
> there are 1000 possible regions, but not all are valid at this time.
> there are 755 valid regions at this time. 000, 666, and anything
> greater than 773 are invalid. There are others, as well, I think.
>
> Each region has an associated "high group" number associated with it.
>
> e.g. 230 has a high group of 99. this means that all 100 possible
> group numbers are valid. 321 has a high group of 08. this means that
> the group numbers 01-09 (odd), 10-98 (even) and 00-08 (even) are valid.
> 11-99 (odd) are invalid for that region.
>
> And yes... that is the sequence. less than 10, odd. 10-98, even.
> less than 10, even. 11-99, odd. (only the gov't)
>
> The complete table is here
>
> http://www.ssa.gov/employer/highgroup.txt
>
> The last 4 have no rhyme or reason. They are approximately sequential.
> when a region runs out of numbers for all the groups it is assigned,
> that region's "high group" will be incremented.
>
The serial values (last 4 digits) starts with 0001. All zeros in region,
group, or serial values are invalid.
There is a gap in the valid groups between 734 and 749. And like the
"555-" telephone numbers there is range reserved for advertising,
987-65-4320 to -4329.
--
Jon H. LaBadie jon@jgcomp.com
JG Computing
12027 Creekbend Drive (703) 787-0884
Reston, VA 20194 (703) 787-0922 (fax)
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