use strict;
use Socket qw( inet_aton inet_ntoa);

local $, = $/;
print map  { inet_ntoa($_) }
      sort { $a cmp $b }
      map  { chomp; inet_aton($_) }
      <DATA>;
    print $/;
__DATA__
128.1.1.0
127
23.4.5.6
255.255.255.255
45.27.128.0
localhost