Ahhh -- thanks for the link. I was just trying to dig up an old NANOG thread which discussed Gmail's use of the same technique. I noticed class E address space

Ahhh -- thanks for the link. I was just trying to dig up an old NANOG thread which discussed Gmail's use of the same technique. I noticed class E address space in my gmail activity log years ago, and a wink from a googler implied this is what they were doing. Nice to have confirmation.