michael replied the topic: Block a quaded IP (e.g. 192.168.254.0/24)
Yeah, the thing you want to research is called CIDR (Classless Inter-Domain Routing) notation.
You can block a single IPv4 address by using /32, masking all 32 bits of the address. /24 means the first 24 bit of the address are masked, leaving the remaining 8 bits to match - so 192.168.254.0/24 is equivalent to 192.168.254.0 with a netmask of 255.255.255.0 or to show it another way, 192.168.254.0 through 192.168.254.254