We weren't able to use the online verification service , which is the reason I wrote the program I described. It didn't validate a "good" SSN, but rather filter

We weren't able to use the online verification service , which is the reason I wrote the program I described. It didn't validate a "good" SSN, but rather filtered out bad ones. http://www.ssa.gov/ http://www.ssa.gov/ and http://www.socialsecurity.gov http://www.socialsecurity.gov both have a lot of useful information about structure and allocation of SSNs if you are looking to do something similar.