* - 95 characters: space through ~
M - 62 characters: A-Z, a-z, and 0-9
m - 52 characters: A-Z and a-z
n - 36 characters: a-z and 0-9
a - 26 characters: a-z
t - 12 characters: 0-9 and - /
d - 10 characters: 0-9
Here are the largest databases I know of which have been verified by me. If you have an online database and would like to be added, please contact blandyuk on my forum. Please note that you will need to verify the size of your database in order to get on my leaderboard.