CIDR One adress 192.168.1.1/32 -> 192.168.1.1 Range 192.168.1.2/31 -> 192.168.1.2 192.168.1.3 192.168.1.3/31 -> 192.168.1.2 192.168.1.3 192.168.1.4/31 -> 192.168.1.4 192.168.1.5 Tools ipcalc