DNS stats are calculated in buckets of Top QName 2 and Top QName 3, but this does not work with second-level domain names like .co.uk. It would be better if these stats are calculated based upon the public suffix list (so queries to www.google.co.uk would count towards stats as www.google.co.uk and google.co.uk and not google.co.uk and .co.uk).

Please see https://publicsuffix.org/list/