What is Localhost (Definition, Working, Use cases) - BrowserStack

Tools like ngrok , localtunnel , or Cloudflare Tunnel might bind to a random high port, such as 11501, before exposing your local server to the internet.

Want to test this yourself? Here are quick ways to launch a service on port 11501:

Some IoT simulators or hardware debugging tools (like ESP32 or Arduino web interfaces) assign ports in the 11500 range for real-time telemetry.