How to Reveal Hidden Wi‑Fi Networks Using Python and Scapy

Introduction

Building on a previous article about detecting hidden cameras, this guide shows how to discover hidden Wi‑Fi networks using Python.

Background

As wireless security awareness grows, many assume that hiding a Wi‑Fi SSID makes it safe, but the router still broadcasts other information that can be exploited to reveal the hidden network.

Environment Setup

Required tools: Ubuntu operating system, Python 3.6, PyCharm IDE, and an external wireless network adapter.

Principle Overview

A router continuously emits signals containing details such as SSID, MAC address, channel, and transmission rate. Using the airodump-ng tool, these packets can be captured. When a Wi‑Fi is hidden, its ESSID field appears as . However, if a client connects to the hidden network, the router may include the SSID in subsequent packets, providing a chance to capture it.

Implementation Steps

1. Monitor Nearby Wireless Signals

Enable monitor mode on the wireless adapter with airmon-ng, then scan for networks using airodump-ng.

Running these commands is required; otherwise the Python program cannot receive wireless packets.

Failure to enable monitor mode results in no data, as shown below.

2. Capture Packets with Python Scapy

Use Scapy to listen on the monitoring interface (e.g., iface) and display captured packets with p.show().

Identify packets whose MAC address matches the target hidden Wi‑Fi, then extract and print its SSID when a client connects.

Conclusion

The method demonstrates that hidden Wi‑Fi networks can be uncovered by analyzing router broadcast packets, using Ubuntu, Python 3.6, and an external wireless adapter. The accompanying code is available on GitHub.