Reading the Valid SSNs section... " Valid SSNsPrior to June 25, 2011, a valid SSN could not have an area number between 734 and 749, or above 772, the highest area number the Social Security Administration had allocated. Effective June 25, 2011, the SSA assigns SSNs randomly and allows for the assignment of area numbers between 734 and 749 and above 772 through the 800s.[34] This should not be confused with Tax Identification Numbers (TINs), which include additional area numbers.[35]
Some special numbers are never allocated:
Numbers with all zeros in any digit group (000-##-####, ###-00-####, ###-##-0000).[36][37]
Numbers with 666 or 900-999 (Individual Taxpayer Identification Number) in the first digit group.[36]
Until 2011, the SSA published the last group number used for each area number.[38] Since group numbers were allocated in a regular pattern, it was possible to identify an unissued SSN that contained an invalid group number. Now numbers are assigned randomly, and fraudulent SSNs are not easily detectable with publicly available information. Many online services, however, provide SSN validation.
Unlike many similar numbers, no check digit is included." [i][/i]
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