uip

A tool to quickly determine the public IP address of a machine behind NAT with the help of STUN servers.

Overview

This tool is as simple as it sounds, when executed, it outputs the current machine's public IP address by sending a binding request to the STUN server and displaying the XOR-MAPPED-ADDRESS or MAPPED-ADDRESS attribute returned by the STUN server.

Install

Either download pre-built binaries from the release page, or use cargo install uip to install it.

Usage

$ uip -h
A tool to quickly determine the public IP address of a machine behind
NAT with the help of STUN servers.


Usage: uip [OPTIONS] [HOST:PORT]

Arguments:
  [HOST:PORT]  STUN server host and port. If PORT is omitted, it defaults to 3478 [default: stun.cloudflare.com]

Options:
  -4, --ipv4-only  Do not use IPv6 addresses when connecting to STUN server
  -h, --help       Print help
  -V, --version    Print version

Default port (UDP 3478):

$ uip stun.cloudflare.com
203.0.113.1

Custom port:

$ uip stun.l.google.com:19302
203.0.113.1

This program use return code 0 to indicate success and a valid IP has been returned. All other return code indicates error.

The program timeouts after 5 seconds in case a response can not be received.

To debug, run it with RUST_LOG=debug uip.

Public STUN servers

• stun.cloudflare.com
• stun.l.google.com
• stun1.l.google.com
• stun2.l.google.com
• stun3.l.google.com
• stun4.l.google.com
• stun.syncthing.net
• stun.xten.com

Servers in China

• stun.qq.com
• stun.miwifi.com
• stun.chat.bilibili.com

public-stun-list.txt (Unverified)

Credits

This script was modified from the stun_client.rs example of the WebRTC.rs project by Rain Liu yliu@webrtc.rs.

uip added better error handling, more friendly command line interface and fallback to MAPPED-ADDRESS attribute in case XOR-MAPPED-ADDRESS can not be found since some servers that I tested does not return XOR-MAPPED-ADDRESS.

License

Copyright 2023 Datong Sun (dndx@idndx.com)

Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or https://www.apache.org/licenses/LICENSE-2.0> or the MIT license <LICENSE-MIT or https://opensource.org/licenses/MIT>, at your option. Files in the project may not be copied, modified, or distributed except according to those terms.