Mark when I was banning at my old website I would ban something like this
203.122.63.15X and that will take out ONLY the block assigned to that idiots server. or you take his part of the back bone by banning 203.122.63.XXX
It has been a while but I think that will will work with a single entry.
^5 and Salute
BT
PS I don't know anyone in Oz or NZ but some of the guys are pretty scattered.