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 2,850,407 websites Google Analytics Anonymize IP Customers. We know of 585,075 live websites using Google Analytics Anonymize IP and an additional 2,265,332 sites that used Google Analytics Anonymize IP historically and 194,373 websites in the United States.
Get a list of 2,850,407 websites using Google Analytics Anonymize IP which includes location information, hosting data, contact details, 585,075 currently live websites and an additional 307,132 domains that redirect to sites in this list. 2,265,332 sites that used this technology previouslyand 194,373 websites in the United States currently using Google Analytics Anonymize IP.
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