/etc/networks file


  In the same way that you can provide names for machines, you can pro-
  vide names for networks. This is useful when setting other configura-
  tions because it allows you to refer to a network by name instead of
  number. Different tools, such as netstat, will translate an IP network
  number to a name using this file.  For one example, you will want to
  use network names in the NFS server configuration. This allows you to
  specify a set of options for a complete network in one step.