The Department of Work and Pensions, UK has an entire /8

Thu Sep 20 05:20:04 UTC 2012

>
> There is still no technical reason that 240/4  cannot be
> rehabilitated, other than continued immaterial objections to doing
> anything at all with 240/4,  and given the rate of IPv6 adoption thus
> far, if not for those,  it could possibly be reopened as unicast IPv4,
> and be well-supported by new equipment, before the percentage of
> IPv6-enabled network activity reaches a double digit percentage...

Don't most IP stacks (still) consider 240/8 and above "illegal
addresses" and won't deal with packets to/from those addresses?
If that's still the case, it'd be another good 10-20 years before
240/8 and above could be released for general use, as nothing would
work with them.

In that case, you might as well start rolling out IPv6 and any new
hardware/software changes ready for v6.