#!/usr/bin/perl

use NetAddr::IP;

  my $ip = new NetAddr::IP 'loopback';

  print "The address is ", $ip->addr, " with mask ", $ip->mask, "\n" ;

  if ($ip->within(new NetAddr::IP "127.0.0.0", "255.0.0.0")) {
      print "Is a loopback address\n";
  }

                                # This prints 127.0.0.1/32
  print "You can also say $ip...\n";