How to Scan for Wi-Fi Networks Under Ubuntu Server

Ubuntu Server typically runs without a graphical interface, making it essential to manage networking tasks directly from the command line. Scanning for available Wi-Fi networks helps you identify the strongest signals and troubleshoot connectivity issues when configuring your server’s wireless connection. Follow these straightforward methods to efficiently scan for Wi-Fi networks directly from the Ubuntu Server terminal.

Method 1: Using the iwlist Command

The most direct and commonly used method to scan Wi-Fi networks on Ubuntu Server involves the iwlist command. This tool is typically pre-installed and provides detailed information about nearby wireless networks.

First, ensure your wireless interface is active. To identify your wireless network interface, run:

iwconfig

This command will list available network interfaces. Your wireless interface usually appears as wlan0 or wlp2s0, but it could vary depending on your hardware.

With your interface identified, execute the following command, replacing wlan0 with your actual wireless interface name:

sudo iwlist wlan0 scan

This command initiates a scan and displays a list of all available Wi-Fi networks, including their SSIDs (network names), signal strength, encryption type, and frequencies. Review this information to select and configure your preferred network.

Method 2: Using nmcli (NetworkManager Command Line Interface)

If your Ubuntu Server installation includes NetworkManager, you can use nmcli, a powerful command-line tool that simplifies network management tasks.

Verify NetworkManager is installed by running:

nmcli -v

If NetworkManager isn’t installed, you can quickly add it with:

sudo apt update && sudo apt install network-manager

Once ready, scan for Wi-Fi networks with the following command:

nmcli device wifi list

This command clearly displays available Wi-Fi networks with their SSIDs, signal strengths, security types, and channels, making it easier to select the optimal network for your server.

Method 3: Using iw Command

The iw command is another versatile tool for managing wireless devices. It’s lightweight and ideal for advanced users seeking detailed wireless information.

Ensure the iw package is installed by running:

sudo apt update && sudo apt install iw

Identify your wireless interface name first (as shown in Method 1), then execute the scan command:

sudo iw wlan0 scan

This command outputs comprehensive details about each Wi-Fi network, including SSID, signal strength (in dBm), frequency, and encryption methods. It provides a more technical and detailed overview compared to other methods, ideal for troubleshooting or advanced configuration.

Regularly scanning for Wi-Fi networks helps maintain reliable connectivity for your Ubuntu Server. Choose the scanning method that best fits your familiarity and needs, and you’ll efficiently manage your wireless connections with ease.

Method 1: Using the iwlist Command

Method 2: Using nmcli (NetworkManager Command Line Interface)

Method 3: Using iw Command

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