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This question already has an answer here:

How is the quantity of views a question has received calculated by Stack Overflow?

Does the site always check the user's IP Address in the database?

marked as duplicate by hims056, Martijn Pieters discussion Jul 18 '14 at 10:19

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Not quite a duplicate, but a fellow MSO user posted an interesting writeup about this at Dissecting the Stack Overflow views counter. Excerpt:

From what I can tell there is now a JavaScript section in each answer page (used to be CSS in 2008):

<script type="text/javascript" src="/posts/3590653/ivc/a947"></script>
<noscript>
    <div><img src="/posts/3590653/ivc/a947" class="dno" alt=""></div>
</noscript>

The last part of the URL - a947 - seems to be dynamically generated. It is changed every 15-20 minutes and is the same for all questions and presumably users (I tried anonymous access, changing my IP address, it stays the same during the interval).

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