Spam system - ban by IP

[QuickSilverIS]

Hi,

Over the last couple of days I have had 13 registrations from two IPs in the same address range - I can find them all by searching the first 3 octets of the IP, however I can see no way of marking them all as spam in one go, is this possible, and if not could it be added in 3.0.4?

Thanks