Which is my actual IP address?

[darknezx]

I'm using a 2wire gateway.

I used http://www.yougetsignal.com/tools/open-ports/ to check if my port is open, and it shows that my ip is 220.255.7.227 (external). For some reason though http://www.whatismyip.com says that it's 121.6.30.164 instead, which is probably true because I can see that my port is open on 121.6.30.164 but not the external IP. My question is why am I shown to be using different IPs? What does an external IP mean?

[liangtam]

the latter is correct

[darknezx]

Thanks for the reply! So which IP was the former showing? Gateway (router) or my computer's external IP, on the internet or on the LAN?

[mike911]

should be 1 of the exchange ip address, somehow sometimes this detectors can detect all the way until the users router end.

[darknezx]

Oh alright thanks. :) But kinda scary though I thought that these kinda IP sites should all be the same because they're probably using the same scripts to find out my physical ip address?