AS IPv4 addresses become more scarce and traded more often, newly purchased IP addresses may previously have been blackholed and are now useless. There are no e

AS IPv4 addresses become more scarce and traded more often, newly purchased IP addresses may previously have been blackholed and are now useless. There are no easy ways to get an IP addressed off a blacklist. With IPv6 it may be easier to justify blocking large ranges essentially due to the very large IPv6 address space.