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For some applications, it's valuable to have globally-unique addresses even if they're not (all) broadly accessible from the open Internet. For example, if you'

For some applications, it's valuable to have globally-unique addresses even if they're not (all) broadly accessible from the open Internet. For example, if you're building private links between networks which don't share an authority for distributing private network addresses (they're administered by different companies or organizations perhaps). I don't know how common this is anymore, but I've seen it in the past.

cesarb 5y ago
> For some applications, it's valuable to have globally-unique addresses even if they're not (all) broadly accessible from the open Internet. For a real-life example of that: according to documentation which can be found at its website, the Brazilian Central Bank has been allocated a full /18 for the national inter-bank network; each financial institution connected to that network receives a /27 or a /28 (or a pair of them) from that range. If you look up that address range on bgp.he.net, you'll find out that it's not announced to the public Internet at all.
JAlexoid 5y ago
There's a case for these, but it's not as broad as needing 16 million publicly usable IPs for IBM alone.