_anonymizeIp()
Tells Google Analytics to anonymize the information sent by the tracker objects by removing the last octet of the IP address prior to its storage. Note that this will slightly reduce the accuracy of geographic reporting.

When using this function to anonymize tracking, you must use the push function and properly associate the function with the tracker object, as illustrated below.

Async Snippet (recommended)

var _gaq = _gaq || [];
_gaq.push (['_setAccount', 'UA-XXXXXXX-YY']);
_gaq.push (['_gat._anonymizeIp']);
_gaq.push (['_trackPageview']);

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Traditional (ga.js) Snippet