Last updated: July 7, 2026
Flagium is a browser extension that shows where the websites you visit are hosted: server location, IP address, and network details.
The short version: Flagium does not collect, store, or transmit any personal information about you. Everything it reads describes the website's server, and everything it stores stays in your browser.
#What the extension reads
When you visit a page and open Flagium, it reads:
- The server's IP address (the website's server, not yours)
- The domain name of the site you're viewing
- The HTTP protocol version (HTTP/1.1, HTTP/2, or HTTP/3)
- Response headers from the website's server
To place the server on the map, it also looks up the country and city where the server sits, the ISP or organization operating it, and the network's ASN. All of this describes the server you're connecting to, not you or your location.
#What it stores
Lookup results are cached in your browser so the same server is not checked over and over. The cache duration is configurable (60 minutes by default), and you can clear the cache from the extension settings at any time.
Your preferences are stored the same way, using Chrome's storage API: interface language, cache duration, and any custom actions you've configured. None of it leaves your browser, and uninstalling the extension deletes all of it.
#External requests
The extension makes two kinds of external requests:
- Geolocation lookups go to
api.ip.sb. The only thing sent is the website server's IP address. Your own IP address is never part of the request, and no cookies are involved. - The WHOIS buttons open
r.sbin a new tab. That happens only when you click one.
#What Flagium does not do
It does not collect your name, email address, or any other personal information. It does not track your browsing history, build user profiles, or run analytics of any kind. It does not sell or share data with anyone, because there is no data to sell. It loads no remote code; everything runs from the code shipped in the extension package.
#Permissions
| Permission | Purpose |
|---|---|
webRequest | Read server IP addresses from HTTP responses |
activeTab | Access info about the current tab you're viewing |
storage | Save your preferences and cache data locally |
clipboardWrite | Copy IP addresses when you click "Copy IP" |
scripting | Detect HTTP protocol version (HTTP/2, HTTP/3) |
<all_urls> | Work on any website you choose to check |
#Changes to this policy
If the extension's data practices ever change, this page will be updated and the date at the top revised.
#Open source
The full source code is at git.m.ac/showfom/flagium if you would rather verify any of this yourself.
#Contact
Email i@m.ac.