Expose Your Local Development Server to the Internet with NATAPP (Free Reverse Proxy)

What is NAT traversal

Most personal computers are located behind a private network (NAT) and do not have a publicly reachable IP address. NAT traversal works as an intermediary that forwards traffic from the public Internet to a specific host inside the private network, allowing external users to reach services running locally.

NATAPP Overview

NATAPP is a free, lightweight NAT‑traversal tool that creates a secure tunnel between the public network and a local machine. It is built on the open‑source ngrok reverse‑proxy and can also monitor traffic on the tunnel.

Setup Procedure

Register an account on the NATAPP website and log in.

Create a new tunnel (the free tier is sufficient for most use cases). Choose the protocol that matches your service (e.g., Web) and specify the local port on which the application listens (e.g., 3000).

After the tunnel is created, NATAPP displays an authtoken. This token acts as a password for starting the tunnel.

Download the client for your operating system, unzip the archive, and locate the executable natapp.exe (Windows) or the corresponding binary for macOS/Linux.

Open a command‑line window in the directory containing the executable and run the following command, replacing <your_token_here> with the token obtained in step 3: natapp -authtoken=<your_token_here> If the command succeeds, NATAPP allocates a public HTTP domain (e.g., xxxx.natappfree.cc) that forwards requests to the specified local port. Anyone who accesses this domain can reach the service running on your computer.

Example

Assume a local web server is listening on http://localhost:3000. After configuring a Web tunnel for port 3000 and starting the client with the authtoken, NATAPP might assign the domain abc123.natappfree.cc. Visiting http://abc123.natappfree.cc from any browser will display the same content as http://localhost:3000.

Security Considerations

Close the tunnel when it is no longer needed to avoid leaving ports exposed.

Do not use the tunnel to expose sensitive services or for malicious activities.

Related Tools

Other NAT‑traversal services with similar functionality include 花生壳 and self‑hosted solutions based on ngrok.