large exempt lists

For different reasons I need to exempt several dozens of subnets. I
have the subnets in cidr format. Shall bopm understand it if I am to
specify it like "*@127.0.0.0/8", or should the subnets have a form
like "*@127.*" ? I think it would be much faster if a special
tree-like structure is being used for cidr lookups instead of a
lineair match against an exempt list.. And yes, it has to be damn fast
(i wouldn't ask it otherwise), even with a load balancing the bopm
bots are scanning many ports at a rate of more than 300 hostscans per
minute in the peak hours.

Thanks in advance for the answer.

--
Evlogi Petrov - ongeboren@UniBG