This example scan 253 hosts on my home wlan in 5 seconds. Change the TIMEOUT and or the ips array as you like. 
use Net::Ping;

# fill this array with your ips
my @ips = map { "192.168.1." . $_ } ( 2 .. 254 );
my @ips_up;

use constant { TIMEOUT => 5000, PORT => 7 };
my $p = Net::Ping->new( "syn", TIMEOUT() / 1000 );
$p->{port_num} = PORT;

$p->ping($_) for (@ips);
while ( my ( $host, $rtt, $ip ) = $p->ack ) {
  push @ips_up, $ip;
}

local $" = "\n";
print @ips_up;

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Boris

In reply to Re^3: Multi-threading ping of a list of hosts.....Again! by borisz
in thread Multi-threading ping of a list of hosts.....Again! by blackadder

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