Tests show it's just too hard to put the unused 240/4 block to work
The 240/4 block of IPv4 addresses – the six percent of the available IPv4 space that is currently not available for public use – should be left alone rather than being added to the pool of available internet resources, according to Geoff Huston, chief scientist of the Asia Pacific Network Internet Center.last February, early in the history of the internet the 240/4 block was reserved for future use.
Huston's post details a recent effort to understand whether internet infrastructure could use the 240/4 block if it were made available. "The open wound of the internet is that we rely on really cheap customer premises equipment in consumer land," he added – and few of those devices are ready to work with the 240/4 block. But because those devices nearly always use NAT – and that tech clearly works at the scale of today's internet – there's no incentive to replace them. Any effort to do so would mean consumers need new routers/modems, which would cost them money without improving their online experience.
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