unicast-extensions/caps/demand.org

• Fixing Windows

Demand for multicast addresses was grossly over-estimated and no viable new addressing mode for class-e ever appeared.

https://tools.ietf.org/html/rfc1112#section-4

1981: Class E IP addresses, i.e., those with "1111" as their high-order four bits, are reserved for future addressing modes.

In the interim, since the last attempts at making class-e addresses work, for some purpose (), most operating systems and stacks chose to treat 240/4 as globally reachable unicast, and those that didn't (windows only, so far as we have found), not allow them at all.

Fixing Windows

Will probably take an RFC