#!/usr/bin/perl

# http://perlmonks.org/?node_id=1135109

use IO::Socket;
use IO::Select;
use strict;
use warnings;

my @ips = map "192.168.0.$_", 1..11; # your IPs here
my $port = 80; # your port here
my $max = 1000; # somewhat smaller than max "open files"

my %handles;
my $n = 0;
my $sel = IO::Select->new;

while( @ips or $sel->count )
  {
  if( @ips and $sel->count < $max )
    {   
    my $ip = shift @ips;
    my $fh = IO::Socket::INET->new(PeerAddr => "$ip:$port",
      Proto => 'tcp', Blocking => 0,);
    $handles{$fh} = "$ip\t\t" . ++$n; 
    $sel->add($fh);
    }   
  elsif( @ips ? $sel->count >= $max : $sel->count )
    {   
    for my $fh ( $sel->can_write )
      {   
      print $fh->connected ? '   ' : 'not', " alive  $handles{$fh}\n";
      $sel->remove($fh);
      delete $handles{$fh};
      }   
    }   
  }