Every .dk domain whose web server address has the reverse-DNS (PTR) name 0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.f.3.5.0.0.5.1.4.0.0.9.1.0.0.6.2.bc.googleusercontent.com, which usually identifies one physical or virtual hosting server. Data comes from our own scanners, which re-resolve every .dk domain in the zone roughly once a week.