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There are many corporations hording Class B blocks. Lots of them. Time to use them or lose them.

This is also a Windows problem believe it or not.

Class E block has 268 million addresses but no existing version of Windows will see/talk to them.

The E block is really 'reserved' and 'meant for test purposes'.

If Windows can't talk to those IP addresses they're actually within spec. Though it is a useless waste of a lot of bits.

Not only that, but Windows before Vista won't work with IPs ending in .0 or .255