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  1. or download this
    
#!/usr/bin/env perl
...
192.168.2.4
192.168.3.33
192.168.4.12
  2. or download this
    $ ./net_netmask.pl 
192.168.1.45 belongs to bob
...
192.168.2.4 belongs to ralph
192.168.3.33 belongs to bob
192.168.4.12 belongs to NOBODY