There are many ways to obtain and use a website's IP address. This is an easy way to find them using a PC.
Steps
1. Navigate to START → Run, ,
2. Enter "cmd" and press enter to open up the Command Prompt window. The following window should appear:
3. Enter "ping", followed by the name of the website (e.g. ping yahoo.com). You should see the following:

4. Take note of the results. The IP address will appear several times on the screen. IP addresses have four numbers, 0-255, separated by periods. This value can be used to bypass website blocks, create website blocks, and a lot more.

Tips
• If you type the IP address into the address bar, it will go to the site, bypassing most filters.

Warnings
• Don't rely on this method to circumvent filters. Many filters will automatically block IP addresses from most popular websites.

Make use of this site http://www.ip-details.com/ip-search/ for finding ip address , it provides nice solution at free cost .

use a packet sniffer, say ethereal or protocol analyzer or something. Listen and see all the bytes running to and from your ports, http, udp, tcp bla bla bla. I use it on chat users see all their hidden passwords and all dat. A secret, though . Not to b used 4 malicious intent.