Wouldn't that be 0.0.0.0/0 ?
Do you know of a published list feed that would be reliable?
Was kinda hoping that McAfee did...
I took the list of entries @ http://bgp.he.net/search?search[search]=akamai&commit=Search (6000+) and consolidated it down to fewer than 200 individual entries. I then compared those entries against my current experiences with handling Akamai CDN sites and came up with a short list of 8 netblocks that look promising.