Like that????
if(($ip=filter_input(INPUT_SERVER,'REMOTE_ADDR',validate_ip))===false or empty($ip)){ exit; } echo $ip; PS
if(($ip=filter_input(INPUT_SERVER,'REMOTE_ADDR',FILTER_VALIDATE_IP|FILTER_FLAG_NO_PRIV_RANGE|FILTER_FLAG_NO_RES_RANGE))===false){ header('HTTP/1.0 400 Bad Request'); exit; }