Bandwidth Thieves

You have noticed that your internet has been running

slowly lately and you think it is because your

neighbors are stealing your bandwidth. You decide

to create a password so that they can no longer

mooch off of your internet. Your internet provider

requires the following for all WiFi passwords.

It must be $6$ characters in length. The first four

characters must be letters followed by two numbers.

The letters can repeat but the numbers cannot.

How many passcodes could you create?