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A lot of IP addresses are used but not visible from the public Internet.

Oh I realise, I just have a hard time believing that Ford even has a tiny portion of their block allocated to anything.

Ford has multiple design centres in different countries plus a lot of subcontractors who may need to connect to stuff from outside.

I can believe that they are using a large part of an /8.

And normal people and smaller companies need their addresses even more.

Then they can bid for them.