Donuel -

Check the link. The info is pretty sketchy (including a total failure to identify where the data is "available to internet operators" but is on a reasonably "safe" site at MSNBC.

The report indicates that the main interest is in sites that are accessible by some routes/users but not by others, if that's a clue that may help your thinking(?).

They've tried to rule out mechanical/system failures, which presumedly would include whole sites/servers "removed" from the internet.

John