Tell Google Analytics to anonymize the information sent by the tracker objects by removing the last octet of the IP address prior to its storage.
https://code.google.com/apis/analytics/docs/gaJS/gaJSApi_gat.html
Analytics and Tracking
Get access to data on 2,836,474 websites Google Analytics Anonymize IP Customers. We know of 551,700 live websites using Google Analytics Anonymize IP and an additional 2,284,774 sites that used Google Analytics Anonymize IP historically and 181,923 websites in the United States.
Get a list of 2,836,474 websites using Google Analytics Anonymize IP which includes location information, hosting data, contact details, 551,700 currently live websites and an additional 270,998 domains that redirect to sites in this list. 2,284,774 sites that used this technology previouslyand 181,923 websites in the United States currently using Google Analytics Anonymize IP.
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