Subnet Mask Cheat Sheet

Subnet Mask Cheat Sheet
Addresses  Hosts  Netmask  Amount of a Class C
/30             4          2              255.255.255.252 1/64
/29             8          6              255.255.255.248 1/32
/28           16        14              255.255.255.240 1/16
/27           32        30              255.255.255.224 1/8
/26           64        62              255.255.255.192 1/4
/25         128      126              255.255.255.128 1/2
/24         256      254              255.255.255.0 1
/23         512      510              255.255.254.0 2
/22       1024    1022              255.255.252.0 4
/21       2048    2046              255.255.248.0 8
/20       4096    4094              255.255.240.0 16
/19       8192    8190              255.255.224.0 32
/18      16384 16382              255.255.192.0 64
/17      32768 32766              255.255.128.0 128
/16      65536 65534              255.255.0.0 256

 

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