title: New Rules to validate US social security number(SSN)
body: <p>I need to validate US SSN number. Currently I have below rules:</p>
  
  <ol>
  <li>Should be 9 digits long.  </li>
  <li>Not allowed are SSNs with all zeros in any digit group (000-xx-####, ###-00-####, ###-xx-0000).  </li>
  <li>Not allowed are SSNs with Area Numbers (First 3 digits) 000, 666 and 900-999.  </li>
  <li>Not allowed are SSNs from 987-65-4320 to 987-65-4329.  </li>
  </ol>
  
  <p>And there are few rules to validate Group Code(-xx-). I have verified in below Site but I couldn't understand the logic of "Group Code"?</p>
  
  <p><a href="http://www.codeproject.com/KB/validation/ssnvalidator.aspx" rel="nofollow">http://www.codeproject.com/KB/validation/ssnvalidator.aspx</a></p>