F Y I Using this tool:

http://robtex.com/dns

It shows:

174.132.131.131 = The Planet
74.52.58.50 = The Planet
67.228.251.106= Voipo.net
67.23.11.26 = Slicehost.net
211.99.122.18 = nomorefunn.moensted.dk ??

Perhaps these are not all Voipo initiated?