Data used on this site is only valid for Social Security Numbers issued before June 25, 2011.
Before SSN Randomization it was easy to Decode SSNs to glean information about the cardholder. This method still applies to SSNs issued before 2011.
Until SSN Randomization, the Social Security Administration published the latest groups of SSNs issued each month in each state. This data is still available on the ssa.gov official website. This data can be found here.