1. Type ping websitename.com in ur command prompt.ping will contact a website and returns you a result.sometimes the larger websites wont reply for PING.you can use 2nd method(WHOIS system).
2.use public websites like domain tools.com, whois.net r networksolutions.com. this will give you the most information about the particular site. just try it..
click here to view->>>>Trace Any IP Address Or Website!
Run->cmd.exe->tracert www.facebook.com->Enter
hi,you can find the ip address through this site whoisXY.com ,it will shows you domain name to ip and ip to domain name,and also you can check the ping response of the website..