The CAS Registry Mumber 95711-57-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,5,7,1 and 1 respectively; the second part has 2 digits, 5 and 7 respectively. Calculate Digit Verification of CAS Registry Number 95711-57: (7*9)+(6*5)+(5*7)+(4*1)+(3*1)+(2*5)+(1*7)=152 152 % 10 = 2 So 95711-57-2 is a valid CAS Registry Number.