I feel like this blog does not accurately describe how large the ipv6 address space even after accounting for it being reduced by 2^64 for the host portion of the address. If it did it would make the concerned comments about /28 ipv6 network sizes seem very misplaced.
A single static ipv4 address is a /32 slice into the ipv4 space and is considered a reasonable to size give out to a single person or even a small business that asks for it. Of course larger companies and telecom operators need larger network allocations and they have gotten them for many years in the past.
Now realize that if a /64 ipv6 network is the minimum size like a single ipv4 address then you see that the ipv6 address space has 2^32 /32 ipv6 networks. Now with ipv6 any technical person and acquire a entire ipv4 internet sized network in a continuous (globally routeable if you want) range.
And if any sized business today can expect buy a single "class c" /24 range of ipv4 it makes sense that large global compaines get a ipv6 /20 network to run their entire network on it.For example cloudflare[1] uses 6 regional /32 networks and a /29 network for all their routing needs. Imaging trying to build cloudflare with less than 32 addresses in a single /24 ipv4 allocation.
ipv6 is so large that you can just design your network without worrying about subnet size and route based on real policy or security boundaries alone. We will run out of MAC addresses before we run out of ipv6
A single static ipv4 address is a /32 slice into the ipv4 space and is considered a reasonable to size give out to a single person or even a small business that asks for it. Of course larger companies and telecom operators need larger network allocations and they have gotten them for many years in the past.
Now realize that if a /64 ipv6 network is the minimum size like a single ipv4 address then you see that the ipv6 address space has 2^32 /32 ipv6 networks. Now with ipv6 any technical person and acquire a entire ipv4 internet sized network in a continuous (globally routeable if you want) range.
And if any sized business today can expect buy a single "class c" /24 range of ipv4 it makes sense that large global compaines get a ipv6 /20 network to run their entire network on it.For example cloudflare[1] uses 6 regional /32 networks and a /29 network for all their routing needs. Imaging trying to build cloudflare with less than 32 addresses in a single /24 ipv4 allocation.
ipv6 is so large that you can just design your network without worrying about subnet size and route based on real policy or security boundaries alone. We will run out of MAC addresses before we run out of ipv6
[1] https://www.cloudflare.com/ips/