Based on what I've seen in last 2 years for all new IANA allocations to
RIR, the assignments from the ip blocks do not happen on day one and in
fact it takes RIR about 2-3 months before they start using that ip block.
a bit more coffee made me realize that what might best occur would
be for the rir, some weeks BEFORE assigning from a new block issued
by the iana, put up a pingable for that space and announce it on
the lists so we can all test BEFORE someone uses space from that