3 ms·
it'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
by justinsaccount 8y ago
it'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.