Now you'll notice, the 'ending' numbers follow the pattern of counting by either even numbers or odd numbers, in that order. It's the same for even numbers: 2, X4, X4 or X4, 4, X8. If it's an odd number, all the other ending numbers will be odd as well, and in a certain order: X3, X5, X5 or X1, X3, X3. On most masterlocks I know, the combination has two numbers that end in the same number, whether it be an even or odd number. I'll explain the theory which I figured out. Once you have these, you can then check your answer by using the math. However, there's an alternate 2-minute method/algorithm (or at least in theory) you can use to immediatly determine the other numbers. There's this whole math thing you have to do which I'm sure if any of you guys have looked up how to break into/get the combo of a masterlock you probably already know. There will be another WHOLE number however that will not end in this secret number. Example: 8, 18, 28, 38 and yes, in that order and way. The dial will get stuck at four numbers that end in the same number. If it sticks inbetween two numbers, you discard this. As the dial gets stuck, you record the number it gets stuck at. So basically, to get the third number of the combination, you would pull up on the shackle and scroll through the numbers. But I need you to tell me if this is correct.

I beileve to have figured out using trial and error, research, and current knowledge the way a masterlock dial combination is set up, at least for ones 9XXXXX and higher.

Master lock serial number list