I think the definition of "subscriber" has changed since 2000. Back then, AOL was mainly an ISP. Now, they do search, ads, IM, internet radio, etc., but few still use them as an ISP. If you look at their site, they only offer dial-up service. By your (unsourced) count, there are more dial-up users on AOL now than there were in 2000. I'm calling BS. I can't see them needing an entire class A subnet anyway. The only reason they have one is that they were around during the beginning of the commercialized internet and have never given any of it back.