I don't have much sympathy. What I read is an ISP saying "gee, all those IPv4 addresses we use internally are costing us a mint, whatever shall I do?". I see

I don't have much sympathy. What I read is an ISP saying "gee, all those IPv4 addresses we use internally are costing us a mint, whatever shall I do?". I see lots of comments here about the merits of IPv4 v IPv6 v CG-NAT. That's all irrelevant. Aussie Broadband, like all Australian ISP's, provide their customers with a router configured to do NAT. If like me you don't want that your on your own you are better off purchasing your own gear. They won't support you, but at least you will be familiar with it. For some ISP's like Optus you have no choice - they've crippled the firmware in their routers so you can't change it. Given the router is doing NAT they can use any carrier. And indeed, some Australian NBN ISP's use IPv4/DHCP, some use PPPoE and others were at one point doing QinQ and of course for pre-NBN ADSL connections it was ATM. Whatever, if your router is doing NAT it doesn't doesn't effect the customer one way or the other. IPv6 is a perfectly reasonable choice for a carrier in those circumstances, and for bonus points it means you can give your customer routeable IP addresses. (It would simplify my home setup considerably.) And it doesn't use a single paid for IPv4 for internal routing! As for the hand wringing about the price - we've known this was coming for decades. We've figured out the solution and it's been available for purchase for years. They've almost certainly replaced their gear at least once in those years. They definitely replaced the routers they've handed out to customers because of the NBN rollout. If they didn't replace it with something IPv6 capable that's piss poor planning - particularly so because unlike most countries the NBN roll out gave Australian ISP's the perfect opportunity to do it.