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by anonymousiam 4 days ago
It's also inflated by large companies with dozens of class A networks, but who actually need a total of maybe just a few class C subnets. I once worked for a company with tens of thousands of computers that were using public IP addresses, but they were all completely firewalled, and they used proxies for limited Internet access.
2 comments
toast0 4 days ago
Which company has dozens of class A networks? The only one I'm aware of with two is HP who had 15/8 and 16/8, but I think they returned at least a significant amount of that.

BBN/successors may have held multiple class As at times, but being large ISPs probably used a lot of the space? Various clouds have a lot of space, but afaik, not in the form of whole class As.

Looks like IBM probably had multiple class As through acquisition, but I don't think they still hold them either?

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dfc 4 days ago
Do you have any examples of large companies that have multiple /8s but can get away with a /21?
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anonymousiam 4 days ago
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.
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dfc 3 days ago
I can't find one /8 that is assigned to boeing. I think your idea of IP allocation is very outdated.
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anonymousiam 1 day ago
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...

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red-iron-pine 3 days ago
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

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dfc 3 days ago
You just listed companies that have one /8 not multiple /8s.
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