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> are there that many private networks in existence that exhaust all IPv4 private network IP ranges? No, but there are many private networks in existence that
by justinsaccount 8y ago
> are there that many private networks in existence that exhaust all IPv4 private network IP ranges?
No, but there are many private networks in existence that use overlapping subsets of the private network ip ranges.
- amluto 8y agoI bet there are. It only takes ~16M residential NAT “routers” to hit 2^32 total addresses. And there are way more than 2^32 things on the Internet.
- justinsaccount 8y agoit's much more simple than that. While there are 16,777,216 available addresses under 10.0.0.0/8, most organizations will do the reasonable thing of allocating nice regular subnets for each area and use case, so you can easily end up with one org using things like 10.0.0.0/16 for infra 10.8.0.0/16 for allocating end user /24s 10.16.0.0/16 for whatever and then that org will merge with another who as it turns out did exactly the same thing, and now the internal subnets all overlap. Even though each company may only be using a few thousand addresses, the address space itself overlaps. Even if you can plan things ahead of time and divided the /8 into 32 /13s or something and give each sub company 500k addresses, you'd still be screwed on a merger.