[mighty_atomic_c]

6 characters? Let me guess, were there restrictions on character space and case?

One place I had an account has a password input that restricts all of those, so it's like an 8-10 character string of all capital letters. I don't understand it at all.

[pwg]

This is often an externally visible code smell that implies plaintext storage of passwords in a char(10) (or whatever the max length is) db column.

[diggan]

You read wrong, not 6 characters but 6 numbers. So no spaces or casing.