[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)



More information about the Novalug mailing list