TO FIND THE NAMESERVER IP OF A HOST OR WEBPAGE

bash-3.00# host -r gmail.com
gmail.com has address 209.85.231.83



bash-3.00# host -r facebook.com
facebook.com has address 69.63.181.12
facebook.com has address 69.63.189.11
facebook.com has address 69.63.189.16
facebook.com mail is handled by 10 smtpin.mx.facebook.com.