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Do you have any examples of large companies that have multiple /8s but can get away with a /21?

Hughes had many class As. Rockwell had a few. McDonnell Douglas had some. Boeing had a few. Boeing eventually acquired all of the above. It's possible that they've divested some of them by now. I haven't worked there for almost 10 years.

I can't find one /8 that is assigned to boeing. I think your idea of IP allocation is very outdated.

Well then they've apparently sold them. They had a lot of /8s 10-15 years ago. I used Boeing as an example of wasted IPv4 space and I guess they've trimmed the waste. If all the other companies that are hoarding IPv4 space did the same, everybody would benefit. Someday IPv6 will be "fully deployed" and the IPv4 space will be a relic from the past.

https://www.hstoday.us/subject-matter-areas/cybersecurity/pe...

e.g.

E.I. du Pont de Nemours (DuPont) 52.0.0.0/8

Ford Motor Company 19.0.0.0/8 Retained by Ford

Prudential Financial 48.0.0.0/8 Retained and used

like, why does Ford need a /8 to make cars? a /20 of public IPs is more than enough for corporate and virtually all of their dealerships

You just listed companies that have one /8 not multiple /8s.

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