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It was developed by the IETF in a working group led by engineers from Cisco and Nokia. It’s approximately as far from an academic solution as you can get.

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An engineer would have preferred to add an additional byte (255.255.255.255.255) if the issue was really about addressing.

Exactly like we did with telephone numbers.

No. IPv6 is significantly easier to subnet. I can tell you the start and finish of 2a07:ffdd::/29 from the top of my head (it's 2a07:ffd8:: - 2a07:ffdf:ffff.....), because there's a nibble boundary every 4 bits, which makes it trivial.

IPv6 has 31 nibble boundaries. IPv4 has 3.

Do me a 10.15.121.75/19 from the top of your head.

I would choose working with IPv6 addresses over IPv4 any time of day.

Engineers added 12 additional bytes requiring the switch to a hexadecimal notation, because 255.255.255.255.255.255.255.255.255.255.255.255.255.255.255.255 would be a little bit too long.

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