Our default metric is the number of globally unique impressions per day. If we have already got an impression from the same IP today (no matter who generated it), we won't count it as unique. It's not a problem since we are not pay-per-impression network and all publishers are in the same position.

However, for debugging purposes we roughly count non-unique impressions too, and you can see the charts on the Stats tab of your ad unit page (https://a-ads.com/ad_units/1/stats). If you have lots of non-unique impressions and no unique impressions, then double check that your traffic comes from the domain that corresponds to the URL specified upon ad unit creation.
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