viewdns.info/portscan
Port Scanner – a ViewDNS.info tool. This web based port scanner will test whether common ports are open on a server. Useful in determining if a specific service (e.g. HTTP) is up or down on a specific server. Ports scanned are: 21, 22, 23, 25, 80, 110, 139, 143, 445, 1433, 1521, 3306 and 3389.