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It's not relevant whether or not it's accessible from the internet.

And that 9/8 allocation predates RFC1918 by at least four years.

I'm curious what you mean by this. RFC1918 is just an update for earlier RFCs that go back farther in time, like RFC1597. And IBM people are credited on the relevant RFCs.

IBM is basically hoarding a bunch of addresses where there's no technical reason to. I get that they aren't required to do anything about it, but it does seem topically relevant.

IBM owns Softlayer. They may have a legitimate need for that many addresses. :)

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