You may find this interesting http://www.nominet.org.uk/tech/hostcount/ http://www.nominet.org.uk/tech/hostcount/ It doesn't have the data you need but the appr

You may find this interesting http://www.nominet.org.uk/tech/hostcount/ http://www.nominet.org.uk/tech/hostcount/ It doesn't have the data you need but the approach would be he same