Does anybody know [a good way to tell] if the TelstraClear DNS servers (.43 & .44) are actually physically separate servers, or just IP's of convenience pointing to the same server?  

I've wondered for a while if a lot of the trouble that I and others have with TelstraClear performance can be laid at the feet of overloaded DNS servers, and tonight I happened to be here when both DNS IP's were simultaneously non-responsive (to both DNS requests and pings) for a while, during which time other IP's were responding fine, then suddenly the simultaneously came back to life.

Sure it could be explained by them being on the same network segment etc but even if that were the case, is it really acceptable for such a crucial part of the network infrastructure of TelstraClear to have such little redundancy?  Especially since in practical terms, we have no choice but to resolve using those DNS servers lest CDN's get confused by the proxy.