You can find your local machines Ip address by typing ' ipconfig' in a dos box. This is obviously not going to be the same as your router which will be dynamically allocated by your ISP, so this will change over time, some ISPs allow you pay extra for a static IP address that will always stay the same (in the UK at least).
Alternatively have a look at www.no-ip.com (there are others) which can give you an alias to your dynamic IP address.
Alternatively have a look at www.no-ip.com (there are others) which can give you an alias to your dynamic IP address.