Re: Lies, damned lies, and statistics that don't lie.
I remember CIDR (subnet masks beening introduced). The change did not require much relearning.
With proxy arp, the change was pretty painless.
If you ping scan the internet, much of the addresses are actually not responding,
There is massive scope to recover addresses. But this is hard work for the people holding addresses.
If IP addresses were taxed or widely traded, there would be a reason to do this hard thing.
The trading of IP addresses is possible, but there is no clear approved way to do this.