So Akamai, CloudFlare et al. will locate servers in a large ISPs data centre. TIL, I just assumed once a resource had been cached then they'd effectively have that collocation (logically); I'm surprised if avoiding the cost of the first hit really saves anything for static content.
Obviously anyone streaming video, it's different.
I wonder if BBC iPlayer (major streaming service in UK) collocate with ISPs.
Will those servers have a local (to the ISP) IP, or do the Akamai IPs get physically routed to the AS?
So, are there CDNs without their own racks anywhere?