ip prefix-list provides the most powerful prefix based filtering mechanism

Here is a quick little tutorial on Prefix-lists for you.

A normal access-list CANNOT check the subnet mask of a network. It can only check bits to make sure they match, nothing more. A prefix-list has an advantage over an access-list in that it CAN check BOTH bits and subnet mask - both would have to match for the network to be either permitted or denied.

For checking bits a prefix list ALWAYS goes from left to right and CANNOT skip any bits. A