Most of those aren't Steam servers and you are missing one or two. Most importantly is:
which appears to be getting tons of content uploaded to it recently.
That's not even the full list of unmetered IP addresses from Internode's list.
These are the IP addresses I have whitelisted:
18.104.22.168* //Vocus? Who is this filtered to?
22.214.171.124* //Old 3FL? Can be removed?
126.96.36.199* //3FL WA?
188.8.131.52 //3FL NSW
The asterisked servers are Australian but they are filtered for use by people on specific ISPs, eg Bigpond or iiNet, so they aren't strictly needed.