Status checker for hundreds IP addresses

Question

I wonder how to make a status checker, checking about 500 addresses in a few minutes? (it\'ll check a certain port if its listening).

But I care about the performanc

Answer 1

C# would be a better option as you can use threads to speed up the process.

In PHP, you can essentially check if a TCP port is open by using fsockopen().

$host = 'example.com';
$port = 80;
$timeout = 30;

$fp = @fsockopen($host, $port, $errno, $errstr, $timeout);
if (!$fp) {
    echo "Port $port appears to be closed on $host  Reason: $errno: $errstr.\n";
} else {
    echo "Port $port is open on $host\n";
    fclose($fp);
}

As kz26 said, you could also get something like nmap to check the ports on a bunch of hosts and use php to call it and process the results as well.