[housemusicfan]

Hanlon's razor applies here.

There is no reason any company of any size should run out of IPv4 addresses internally, IF they are doing proper IP management. If I were to wager a guess I'd say there was a lot of waste going on, issuing /24s or larger to teams when all they need are /29s etc. It adds up over time. Once they exhaust private IP space they can always buy more at auction. They are Amazon after all, there's no shortage of money. This is just mismanagement of resources.

[secabeen]

Comcast has 29.6 million Internet subscribers: https://expandedramblings.com/index.php/comcast-statistics/

If you wanted to assign a single non-routable IP in the 10/8 space to each of those cable modems, they would be 13 million IPs short.

[ben0x539]

Can you elaborate on proper IP management? Isn't that sort of what the parent post is talking about with splitting the network into regional chunks?

I'd imagine few service teams at Amazon would get very far with a /29, let alone a /24, if they have to put all their stuff on that.