Subnet mask Cheat sheet

AddressesNetmaskAmount of a Class C
/312255.255.255.2541/128
/304255.255.255.2521/64
/298255.255.255.2481/32
/2816255.255.255.2401/16
/2732255.255.255.2241/8
/2664255.255.255.1921/4
/25128255.255.255.1281/2
/24256255.255.255.01
/23512255.255.254.02
/221024255.255.252.04
/212048255.255.248.08
/204096255.255.240.016
/198192255.255.224.032
/1816384255.255.192.064
/1732768255.255.128.0128
/1665536255.255.0.0256
/15131072255.254.0.0512
/14262144255.252.0.01024
/13524288255.248.0.02048
/121048576255.240.0.04096
/112097152255.224.0.08192
/104194304255.192.0.016384
/98388608255.128.0.032768
/816777216255.0.0.065536