Cidr
CIDR Notation Reference Chart
Subnet maskNotation255.255.255.252 /30 255.255.255.248 /29 255.255.255.240 /28 255.255.255.224 /27 255.255.255.192 /26 255.255.255.128 /25 255.255.255.0 /24 255.255.254.0 /23 255.255.252.0 /22 255.255.248.0 /21 255.255.240.0 /20 255.255.224.0 /19 255.255.192.0 /18 255.255.128.0 /17 255.255.0.0 /16