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|System Administration Guide: Naming and Directory Services (NIS+)|
The netmasks table contains the network masks used to implement standard Internet subnetting. The table has three columns.
Table 23-10 netmasks Table
For network numbers, you can use the conventional IP dot notation used by machine addresses, but leave zeros in place of the machine addresses. For example, this entry
means that class B network 172.31.0.0 should have 24 bits in its subnet field, and 8 bits in its host field.