function ipcalc ($ip,$mask) {
	# Created by Daniel Lafraia
	# www.lafraia.com
	# Please do not remove this header
	$return = array();

	$octets = array("ip" => preg_split('/\./',$ip),
			"mask" => preg_split('/\./',$mask));

	foreach ($octets as $obj => $split) {
		foreach ($split as $val) {
			if ($val >= 0 && $val <= 255) {
				$octets[$obj]['binary'] .= str_repeat("0",8-strlen(decbin($val))).decbin($val);
			} else {
				print "Erro: Item '$obj' inválido";
				return -1;
			}
		}
	}
	if (! preg_match("/^(1+)0+$/",$octets['mask']['binary'],$matches)) {
		print "Erro: Item 'mask' inválido";
		return -1;
	} else {
		$return["maskbits"] = strlen($matches[1]);
	}

	$return['netid']     = bintoIP(substr($octets['ip']['binary'],0,$return["maskbits"]).str_repeat("0",32-$return["maskbits"]));
	$return['broadcast'] = bintoIP(substr($octets['ip']['binary'],0,$return["maskbits"]).str_repeat("1",32-$return["maskbits"]));
	$return['netstart']  = bintoIP(substr($octets['ip']['binary'],0,$return["maskbits"]).str_repeat("0",32-$return["maskbits"]-1)."1");
	$return['netend']    = bintoIP(substr($octets['ip']['binary'],0,$return["maskbits"]).str_repeat("1",32-$return["maskbits"]-1)."0");
	$return['wildcard']  = preg_replace(array("/1/","/0/"),array("a","b"),$octets['mask']['binary']);
	$return['wildcard']  = bintoIP(preg_replace(array("/a/","/b/"),array("0","1"),$return['wildcard']));
	return $return;
}

function bintoIP ($bin) {
	return bindec(substr($bin,0,8)).".".
	       bindec(substr($bin,8,8)).".".
	       bindec(substr($bin,16,8)).".".
	       bindec(substr($bin,24,8));
}