# What this page can tell about you

> A walkthrough of what a website can infer about a visitor without cookies or permissions: passive browser signals, IP-derived coarse geolocation, fingerprinting surfaces, and how that data reaches a real-time ad auction.

## What is on this page

A demonstration, built on this site, of the signals a visitor hands over passively: browser and device characteristics, coarse geolocation derived from the connecting IP, and the fingerprinting surfaces available to any page. It then shows how those signals are packaged into a bid request in a real-time ad auction. It is a teaching page about tracking, not a tracker: the demo does not persist the visitor IP.

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Source: https://felipealmeida.tech/watched