IS there way to scan my actual IP address?

[mycompcrashed]

hi,
I use GRC shields up free online tool to scan my computer at least I was expecting it to scan my firewall. i'm using a local router which connects to ASDL broadband and have a single PC connected to it.
When I scan with GRC shields up, so far it scanned my ISP gateway, because today it showed me NETBIOS name which was not mine and it had my ISP names on it. So now I realized so far GRC scanned not my local machine but my ISP firewall. : (
Anyway is there a way to scan my actual firewall? ( a free online tool preferred )
thanks

 

[Hawkeye22]

Shields up will scan the same address that http/www.whatsmyip.org/ reports back, which is fine.