Hitting the button below will remotely scan your computer system's IANA^*-assigned TCP ports and indicate which ones are found to be open to the Internet.

Since this test is based on multi-connection requests (one could think of it as a web attack), please ensure that you have carte blanche to go ahead should this system not be yours.

^* IANA: Internet Assigned Numbers Authority

Note: the process may take a minute or two...