MD5 Quick Facts

Number of possible an md5 string:

16 possibilities for each digit (0-9 (10 possibilities) and A-F (6 possibilities)), there are a total of 32 digits
so the number of possible combinations is :
16 ^ 32 : 3.4028237 * 10^38

Another way you could calculate it is:

Each Digit of an MD5 represent 4 bits (Hexadecimal). So for 32 digits we have a total of
32 * 4 = 128 bits
so 
2^128 = 3.4028237 * 10^38
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