There is a world of SEOs who continually search Google to track how their keyword phrases are ranking. But they do not just search the main Google.com page, they search each and every Google data center by IP address.
A WebmasterWorld thread reports that Google is now redirecting some of these searches from the IP address to Google.com. I have confirmed this to be true, by following these steps:
- Go to http://188.8.131.52/
- Enter in search phrase and click Search
- Google will redirect you to Google.com, for that search
This does not mean you can't search specific data centers. Now you need to replace www.google.com with the IP address, so in this case, http://184.108.40.206/search?q=search+engine+roundtable.
Forum discussion at WebmasterWorld.