Under the analytics tab under the "Clicks Report" you will be presented with all of the information regarding each and every IP which clicked on your ads.
Some IPs may be blocked off automatically by the system but should you want to block off a specific IP manually, simply toggle the blocked IP column for the relevant IP to "Yes" in the appropriate row and the suspicious IP will be blocked immediately.

Note- This IP will be moved to your "manual exclusion list" under "settings"--->"manage auto IP blocking"

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