What does non-consecutive actually mean in practice

It means the third octet jumps rather than counts. Four addresses that read as a tidy sequence are four Class C blocks on paper and one contiguous purchase in reality, and anyone can see that at a glance. Non-consecutive means there is no shared prefix and no visible ladder, which is the difference between diversity that survives inspection and diversity that only survives a headline.

The ladder problem, concretely

Suppose an allocation hands you addresses whose third numbers run one, two, three, four under an identical first and second octet. Technically those are four different blocks. Practically they are one range that somebody bought in a single piece, and the sequence itself is the evidence. Any observer comparing two of your sites sees the pattern immediately without needing any tooling.

Now suppose the third octets bear no relation to each other and the first two octets differ as well. There is no arithmetic connecting the addresses. Comparing two sites returns nothing, and comparing ten returns nothing, because there is nothing to find.

Why scale is the hard part

Almost any provider can produce four unrelated-looking addresses. The difficulty appears at forty, or four hundred. Scattered blocks have to be acquired separately over time, from different sources, and held. A provider without that inventory will start you on genuinely distinct addresses and then, as your order grows, quietly fall back to whatever contiguous range it has spare.

That is the failure mode worth watching for, because it is invisible at the point of sale and only shows up in the addresses you receive later. Drawing from more than thirteen hundred separate blocks is what makes the property hold for a large order rather than for the first few sites.

How to confirm it on your own allocation

1. Write out your addresses side by side and compare the first three numbers of each.
2. Look for arithmetic. Any run of consecutive values is a flag, and so is a shared first-and-second-octet prefix across many addresses.
3. Sample a few with a reverse lookup to see what an outsider sees rather than what the panel says.

Do this at the start and again after any order that grows the allocation substantially. The second check is the one people skip, and it is the one that catches the fallback described above.

What it does not solve

Scattering addresses removes an arithmetic pattern. It does not remove a shared nameserver pair, a registrar batch, an identical template or a mechanical link graph, and none of those care how your octets are arranged. Treat the addressing as the floor rather than the finished job. The related checks are collected in IP Diversity, and what an order contains is on the USA page.