🚩 Flagium — Instantly See Where Any Website Is Hosted

As web developers and site administrators, we constantly need quick visibility into where our websites are actually being served from.

Whether you're debugging CDN routing, verifying geo-rules, or simply curious about the infrastructure behind a site, Flagium is the Chrome extension that puts this information right at your fingertips.

🔍 What Is Flagium?

Flagium is a lightweight, privacy-focused Chrome extension that instantly displays server location and network details for any website you visit.

A glance at the toolbar shows the country flag of the server you're connected to — and one click reveals deeper infrastructure information.

🚀 Key Features

1. Instant Visual Feedback

The extension icon automatically updates to show the server’s country flag — no clicks required.

Know immediately whether you're hitting your US origin server, a European CDN edge node, or an unexpected location indicating routing issues.

2. In-Depth Server Information

Click the icon to view real-time backend details, including:

IP Address
Geographic Location (country / city / region)
ISP & Organization
ASN (Autonomous System Number)
Protocol Version (HTTP/1.1, HTTP/2, HTTP/3)
HSTS Status

3. One-Click WHOIS Lookups

Quick-access lookup buttons for:

Domain WHOIS
IP WHOIS
ASN WHOIS

Add custom tool integrations using URL templates, such as:

https://rdap.ss/whois/{domain}
https://rdap.ss/whois/{asn}
https://bgp.tools/prefix/{ip}
https://bgp.he.net/{asn}

5. Smart Local Caching

Flagium caches lookup results (configurable: 1 minute → 24 hours) to minimize API calls while keeping information fresh.

All cached data remains 100% local in your browser.

🔧 Real-World Use Cases

CDN Verification

Confirm which edge region is serving your content.

Use VPN to compare routing across multiple regions.

Debugging Geo-Routing

Identify where requests are actually landing to troubleshoot DNS issues, CDN misconfigurations, or origin failover.

Security & Threat Research

Expose hosting infrastructure, ISP, and ASN instantly.

Combine with custom actions for Shodan, VirusTotal, etc.

Competitive / Infra Analysis

See which CDN or hosting provider any website uses — instantly.

Tracking Protocol Adoption

Monitor HTTP/2 & HTTP/3 usage across the web and verify your own deployments.

🔐 Privacy-First Design

Flagium was built with privacy as a core philosophy:

❌ No tracking / no analytics
❌ No data collection
❌ No external storage — cache never leaves your browser
➕ Minimal API usage — only when geolocation is needed

https://m.ac/privacy-policy-for-flagium/

🌍 Multi-Language Support

Flagium currently supports:

English
Simplified Chinese
Traditional Chinese
Japanese
Many more

The extension auto-detects your browser language.

🚀 Getting Started

Install Flagium from the Chrome Web Store
Visit any website
See the server’s country flag on the toolbar
Click for complete server infrastructure details

No configuration required — it works immediately.

Advanced users can customize caching duration, language, and custom action buttons in the Options page.

💙 Free & Open Source

Flagium is open source and completely free to use:

No API keys
No subscriptions
No hidden features

A simple, fast, privacy-respecting tool for people who build and maintain the web.

📌 Install Flagium on Chrome Web Store:

👉 https://s.ee/flagium

Compatible with Chrome, Microsoft Edge, Brave, Vivaldi, Arc, and all Chromium-based browsers.

On this page

Flagium - Instantly See Where Any Website Is Hosted