Netmask    Address Prefix Length    Hosts / Class C's / Class B's / Class A's

255.255.255.255    /

255.255.255.254    /

255.255.255.252    /

255.255.255.248    /

255.255.255.240    /

255.255.255.224    /

255.255.255.192    /

255.255.255.128    /

255.255.255.0    / (Class C)     /

255.255.254.0    /     /

255.255.252.0    /    , /

255.255.248.0    /    , /

255.255.240.0    /    , /

255.255.224.0    /    , /

255.255.192.0    /    , /

255.255.128.0    /    , /

255.255.0.0    / (Class B)    , /  /

255.254.0.0    /    , /  /

255.252.0.0    /    , /  /

255.248.0.0    /    , /  /

255.240.0.0    /    ,, /  / 16
255.224.0.0    /    ,, /  /

255.192.0.0    /    ,, / , /

255.128.0.0    /    ,, / , /

255.0.0.0    / (Class A)    ,, / , /  /

254.0.0.0    /    ,, / , /  /

252.0.0.0    /    ,, / , / , /

248.0.0.0    /    ,, / , / , /

240.0.0.0    /    ,, / ,, / , /

224.0.0.0    /    ,, / ,, / , /

192.0.0.0    /    ,,, / ,, / , /

128.0.0.0    /    ,,, / ,, / , /

0.0.0.0    / (The Internet)    ,,, / ,, / , / 256

.

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