Similar to the 1.0.0.0/8 experiment... YouTube (only AS36561) will be
announcing 27.128.0.0/12 to allow APNIC to study backscatter/traffic
to this unallocated space in ipv4 land. We'll start in the next 24
hours.
This range is obviously less interesting than 1.x, but figured I'd let
you all know anyway. 
Cheers.