I need to ingress/egress filter unassigned netblocks and I am having a very hard time finding a comprehensive list of unassigned class B and C networks. It is extremely time consuming to go through the different regional registrars to come up with such a list, not to mention putting networks back together to minimize the number of rules. IANA has good class A and D lists, B and C classes are however listed "in bulk" (next to useless). Searching through Google I came up empty handed. Does anyone have a comprehensive list they are willing to share, or links to sites that list these network blocks. TIA
