Google Data Centers - IP Addresses Tools

Many times if you are doing a search in Google for a particular keyword the search results you see on one day (sometimes even minutes or seconds apart) will vary. Why? Because you are viewing a different Google IP/ Data Center. Google uses different Data Centers and IPs to test new ranking algorithms and to gradually “roll-out” update changes. Given the size of their database (billions of pages) one can imagine it might take a little while to update what the world sees in the keyword search engine results after changes are made.