There was a content filter that ran the Wget software in 2002 from the same backbone provider, however a different IP block.
During 2008 this content filter made the transition to a masked UA.
I've had the this 216 range denied since 2009 for mysterious activity.
Were webmasters capable of subnet searches, than there'd be less innocents service-less. (Suppose I could not be so extreme and make the denied range smaller).
Two things would need to happen:
1) More webmasters would need to care and be aware of the traffic that passes through their doors.
2) Backbones would need to ID the subnets.