What is my user agent?
Reading your browser…
A two-sided mirror for your browser
Your user agent is the line of text your browser sends to every site, identifying the browser, version, and OS.
List.My.Info is essentially a two-sided mirror for your web browser.
Reflects back exactly what your browser broadcasts to every site you visit: raw user agent, request headers, IP, and rough location — echoed straight from my backend.
Surfaces what your browser quietly knows about you — screen, hardware, GPU, locale, network — none of which ever leaves your device.
Every value labeled by source, computed live, and stored nowhere. Built to grow into a suite of small dev tools.
Frequently asked questions
What is a user agent?
A user agent is a line of text your browser sends with every request. It identifies the browser and version, the operating system, and the rendering engine, so servers can tailor their responses.
Why does my browser version look generic, like 126.0.0.0?
Modern Chromium browsers deliberately reduce the user-agent string to limit fingerprinting: the minor version is zeroed, the OS version is frozen, and the device model is hidden. Precise values are exposed only through User-Agent Client Hints, which a site has to request.
What is the difference between "sent to our server" and "read from your browser"?
Server-observed values — your raw user agent, request headers, IP, and geolocation — are exactly what our backend received. Client-derived values — screen, hardware, locale, and high-entropy hints — are read from your browser with JavaScript. Every field on this page is labeled by its source.
Do you store any of this?
No. There are no accounts, cookies, analytics, or third-party scripts, and nothing is logged or saved on a server. Everything is computed in your browser or read from the request you just made, then forgotten.
What does my IP address reveal?
Your public IP address is how your network is reached on the internet. It can indicate an approximate location (city, region, country) and your internet provider, but not your identity — and we never store it.