Some of the InternetNamesForBusiness ranges are sub-ranges of larger Codero ranges, which should also be blocked (eg all 216.55 can be combined).
dstiles, I've had 216.55.128-191 denied since 2004 under the former name of Abacus America Inc. Today that same company operates under the name of aplusnet, however the 216.55. IP's have been reassigned.
There is a small community college in the 216.55. 188.8.131.52 - 184.108.40.206 My nephew attends and the college was involved in an extensive widget project. They offer wifi on-campus for students.