One /12...
That would be one-sixteenth of a /8, the size of block each RIR was routinely handed until recently (some big ISPs, companies and even individual universities already holding more than one of those). Good illustration just how tight the shortage is getting ...
... so ISPs will finally be activating IPv6 and understanding that IPv4 is closed for new business, right? Right? Some already do of course - but just an ominous silence from Virgin, Zen and others. (Vague mumblings about it from BT, and some tickets relating to enabling support for it within their own network, but nothing promising publicly.)
Anything to do with the convenient "flaw" that CGNAT happens to kneecap servers and P2P traffic?