This is a small tip which shows you how to know an IP address of a given domain name. The commonly used way is command ping. Let's have a look to how it works.
Output:
PING blogspot.l.google.com (72.14.207.191) 56(84) bytes of data.
I can alternatively use another way to do that by using command host as the following
host vntutor.blogspot.com
Output:vntutor.blogspot.com is an alias for blogspot.l.google.com.
blogspot.l.google.com has address 72.14.207.191
The second way is a DNS lookup utility which is not only tell you what is IP address but also related alias around.
dig -x ?