They are still likely in the same address range (like 144.25.2.1,144.25.2.2, 144.25.2.3, etc.)
I would not expect them to be scattered about the entire address range (like 5.98.66., 66.73.56.99, 3.56.84.6, etc.)
That's a good point. I'll see if I can find a list of their DNS servers.