If you know his ISP you will be able to tell which is his, and which isn't. Finding the IP is simple, just type in netstat -n.
The hostname will be like 890atlanticbb.net:3030
so when you type in netstat -n, look for the number ending in 3030.
The IP would be 12.125.46.2:3030
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View the message header information and read from the top down. It should be the last IP in the header.
To use CMD and netstat, you need to have some type of connection with your friend. Not always the case. Email would be a good and easy first step. If not, initiate an IM Chat with your friend. This will help the netstat info.
Start>Run>cmd>
C:>ipconfig
I.P address.........................xxx..xxx...
chk for this.