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if you want then there is 1 way i.e trying Random numbers. An average key contains 16 alphabets+Numbers, then the total cases would be 16! (16 factorial) * 26 alphabets into 10 numbers.
And this number will so large to check 1 by 1 on the server. (And your IP or ID will be blocked after a few tries).
Jayesh also finds these things on the internet (Now don’t ask how where … you have internet, try yourself). And most of these accounts he creates himself. (Mostly by Bins).
That is why I always tell you to do yourself.. by this you will get some good knowledge of what is this world all about.