This chart will provide you with information regarding the top clicking IP ranges that have clicked on your ads.
For example: if you've had four clicks from three different IP's-
two clicks from 220.127.116.11
one click from 18.104.22.168
one click from 22.214.171.124
the top IP range that will be displayed there will be 1.2.3.*
This is of course just an example.