This isn’t new news by any means but its helpful for those who are looking to test their search engine results with Google’s new roll-out; Google Caffeine.
Matt Cutts from Google confirmed that the IP Address 209.85.225.103 is hitting the data center that is running the Caffeine index about 50% of the time.
So there you have it; Caffeine is live on a single data center. More Google news to come in the near future… 
Can you explain how we can use this to better predict results from Caffeine?
I really can’t wait to see how Google Caffeine will affect not only the user’s search experience but also how SEO’s like me will optimize sites to get high rankings.
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