wilderness - 3:15 pm on Jul 5, 2011 (gmt 0)
I'm already blocking by IP's but my list was getting rather large.
A likely reason for a "rather large", is that your denying to the precise Class D IP, rather than a mass provider range?
However even when accumulating larger provider ranges, after a while requires consolidation of ranges.
Denying by IP is much less server intensive than denying by host.