Web site administrators like to know the IP addresses used by Google when it is spidering. You can also sometimes use Google’s IP address to reach the site www.google.com if the domain cannot be contacted by its name.
Answer:
The following IP address ranges belong to Google:
64.233.160.0 – 64.233.191.255
66.102.0.0 – 66.102.15.255
66.249.64.0 – 66.249.95.255
72.14.192.0 – 72.14.255.255
74.125.0.0 – 74.125.255.255
209.85.128.0 – 209.85.255.255
216.239.32.0 – 216.239.63.255
Like many popular Web sites, Google utilizes multiple Internet servers to handle incoming requests to its Web site. Instead of entering http://www.google.com/ into the browser, a person can enter http:// followed by one of the above addresses, for example:
http://74.125.224.72/
Only certain addresses from Google’s pool will work depending on the physical location of the browser.
Besides serving www.google.com, some of the Google’s IP addresses above are utilized by its Googlebot Web crawlers.