What you can't do:
- Prevent people spoofing their IPs.
- Block IP addresses on sites you don't control (e.g. Google search results).
What you can do:
Google employs automatic filters to combat click fraud and invalid clicks, but has a number of suggestions for things you can do to monitor and detect invalid clicks yourself:
- Track invalid clicks already captured by Google using the Invalid Clicks column.
- Monitor the conversion rate of clicks to look for sudden drops or unexpected behaviour.
- Try the invalid clicks troubleshooter.
- Report suspected invalid clicks (within the U.S. or outside the U.S.)
- Relax. Click fraud would be a huge threat to Google's business if they ignored it, so it's in their interest to actively counter it and investigate your concerns.
Reference:
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How Google prevents invalid activity:
https://support.google.com/adsense/answer/1348752 -
How you can help to prevent invalid activity:
https://support.google.com/adsense/answer/1112983?hl=en - http://webmasters.stackexchange.com/questions/8252/how-can-i-prevent-invalid-clicks-on-my-adwords-campaigns
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