Class A Host/Subnet Table

Class A Host/Subnet Table

Class A
Number of
Bits Borrowed            Subnet         Effective     Number of      Number of Subnet
from Host Portion        Mask           Subnets       Hosts/Subnet   Mask Bits
-------               ---------------   ---------     -------------  -------------
  1                    255.128.0.0            2       8388606           /9
  2                    255.192.0.0            4       4194302           /10
  3                    255.224.0.0            8       2097150           /11
  4                    255.240.0.0           16       1048574           /12
  5                    255.248.0.0           32        524286           /13
  6                    255.252.0.0           64        262142           /14
  7                    255.254.0.0          128        131070           /15
  8                    255.255.0.0          256         65534           /16
  9                    255.255.128.0        512         32766           /17
  10                   255.255.192.0       1024         16382           /18
  11                   255.255.224.0       2048          8190           /19
  12                   255.255.240.0       4096          4094           /20
  13                   255.255.248.0       8192          2046           /21
  14                   255.255.252.0      16384          1022           /22
  15                   255.255.254.0      32768           510           /23
  16                   255.255.255.0      65536           254           /24
  17                   255.255.255.128   131072           126           /25
  18                   255.255.255.192   262144            62           /26
  19                   255.255.255.224   524288            30           /27
  20                   255.255.255.240  1048576            14           /28
  21                   255.255.255.248  2097152             6           /29
  22                   255.255.255.252  4194304             2           /30
  23                   255.255.255.254  8388608             2*          /31

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