> There are been other posts contributing this, which I agree with:
> - Not globally routable.
> - No registration.
> - No cost.

Good start.

What about globally unique? Not immediately clear one can get
uniqueness without some sort of registration. But the registration
might be fairly painless.

> My personal view on this is that there needs to be some ambiguity as
> well, for two reasons:

I don't follow what you mean by "ambiguous".

> a) Ambiguous addresses would obviously be a smaller block which in turn
> would be a lot easier to obtain from IANA; you know this part a lot
> better than I do so I'd be happy to hear your views about this.
> b) Ambiguous addresses are a guarantee that they will never be globally
> routable because the block is too small.

Well, there are no guarantees, but if there was a chunk of address
space reserved for "globally unique, but no expectation that it will
ever be routed on the public internet", and it came out of a well
known prefix, I'd expect that enough ISPs would filter on them to keep
them from being usefully routable in a global sense.

Thomas
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