CIDR
Here is a table of network masks:
Short Full Maximum Comment
Form Form #Machines
/8 /255.0.0.0 16,777,215 Used to be called an `A-class`
/16 /255.255.0.0 65,535 Used to be called an `B-class`
/17 /255.255.128.0 32,767
/18 /255.255.192.0 16,383
/19 /255.255.224.0 8,191
/20 /255.255.240.0 4,095
/21 /…
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