this post was submitted on 08 Jul 2025
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Pretty insane that around 0.4% of all IPv4 addresses are wasted.
Wayyyyyy more than that is wasted.
Apple (and others) used to have an A class. I think they gave some of it back to the pool.
public universities have entered the chat
A few years ago my old university finally went with NAT instead of handing out public IPs to all servers, workstations and random wifi clients. (Yes, you got a public IP on the wifi. Behind a firewall, but still public.) I think they have a /16 and a few extra /24s in total.
Honestly there isn't much reason to go with NAT unless you are looking to lease/sell IPs
The sad part is that almost no universities do IPv6
I kinda get why organisations don’t migrate.
IPv6 just hands you a bag of footguns. Yes, I want all my machines to have random unpredictable IPs. Having some extra additional link local garbage can’t hurt either, can it? Oh, and you can’t run exhaustive scans over your IP ranges to map out your infra.
I’m not saying people shouldn’t migrate, but large orgs like universities have challenges to solve, without any obvious upside to the cost. All of the above can be solved, but at a cost.