[support] Banning entire subnets

[mick]

I am copping upto 50 access violations per day, 90% of them from 1 of 4 subnets and instead of banning each IP address I would like to ban the entire subnets they are comming from, 
eg 66.249.65.74 is one of many similar addresses 
instead of individually banning 66.249.64.0 thru 66.249.95.255 I wish I could enter 66.249.64.0/19 and be done with that group of trouble makers.

I'm also curious about cron appearing to be run by these unauthorised users.

mick