Proxy Detector

Disclaimer: Provided as is, where is. FREE forever. Use at your own risk. All users releases the programmer of all liabilities. You assumes all risks and etc. Designed for Chrome and Edge. By use, you agree to everything. I just made it for a simple reason and to be shared with everyone who can find it to be useful. Seng Thao. All rights reserved. 2025 No data is collected, send, or transferred. Description and purpose below. This is just a small script that I made for Chrome and Edge. I needed to frequently check the proxy connections in my browser when I'm browsing. This is because I sometimes set flags in my browser through certain proxy to test websites. Also Windows doesn't "really" track your public IP address. That's assigned by your ISP. For example if you try to find your "public IP address" in windows, it's kind of difficult. Open command prompt, type in: nslookup myip.opendns.com resolver1.opendns.com And then you can see your public IP. Your public IP is what everyone see you on the internet. If you use the commands: ipconfig or ipconfig /all You only get your private IP. For example: In CMD prompt: "C:\Program Files\Google\Chrome\Application\chrome.exe" --proxy-server="socks5://127.0.0.1:9150" When I set a flag to have Chrome use the Tor browser proxy, I like to know if it actually is going to the correction proxy and port. If I am going through the correction proxy, I can access onion sites and open/view them. (Anonymity is excluded though.) Another example is if I'm running the Tor expert bundle service and I push the following proxy: "C:\Program Files\Google\Chrome\Application\chrome.exe" --proxy-server="socks5://127.0.0.1:9050" Now I am connected through the expert bundle daemon. There are other uses too, if your browser was hijacked, your company is pushing you through a proxy for particular sites and many other reasons. More commonly, if you're use a VPN. Did your proxy change, IP change, what can websites you visit see your outside IP as? So to answer those many questions, I designed this small extension to use. You can download this from the Chrome or Edge store. To remove it, right click on the extension on your browser and select Remove from your browser. https://www.thugon.com/proxydetectorprivacypolicy.html What's your public IP address? It was built to answer these questions as well: The goal is to quickly find out if a proxy is being used. Did your IP/proxy change? Is a PAC (Proxy Auto-Configuration) file being used. This is commonly used in enterprises. If using a VPN, did the proxy change? See the current mode that Chrome is in? Display anonymizing service? direct Chrome/Edge connects to the internet directly (no proxy). system Chrome/Edge follows your computer’s system-level proxy settings. auto_detect Chrome/Edge is trying to automatically detect a proxy (WPAD). pac_script Chrome/Edge is using a Proxy Auto-Configuration (PAC) file. fixed_servers Chrome/Edge is using a manually set proxy server. PAC Script: http://proxy.company.com/proxy.pac Gives your external (public) IP address — the IP that websites see when you connect to them. It detects potential proxy/VPN use or network rerouting — for example: You connect to a VPN → IP changes → warning appears You disconnect → IP returns to baseline → warning disappears The extension can’t directly detect “VPN software,” but: If your public IP suddenly changes (especially to another region), And Chrome’s proxy mode changes to "system" or "fixed_servers", it infers that a VPN, proxy, or similar rerouting method is active. Summary Table Detection Type Example Output How It Helps Proxy Mode direct, pac_script, fixed_servers Know how Chrome is routing traffic Proxy Host proxy.example.com:8080 Identify manual proxy servers PAC Script http://proxy.company.com/proxy.pac See if a PAC configuration is in use Public IP 203.0.113.42 See your external address Proxy/VPN Warning ⚠️ “Traffic appears to be routed through a proxy!” Detect network rerouting Network Change Detection Baseline IP ≠ current IP Detect new network / VPN connection What it cannot detect Just to be clear: ❌ It can’t see other apps’ traffic (only Chrome/Edge proxy settings). ❌ It can’t read encrypted VPN configurations directly. ❌ It doesn’t monitor which specific websites use which proxies (Chrome doesn’t expose that). I hope this helps you. Sincerely, Seng Thao www.thugon.com 2025