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How Do I Find All IP Addresses on My Network in Linux?

Published in Network Administration 3 mins read

You can discover all IP addresses on your Linux network using a few simple commands. Here's a breakdown:

1. Using the nmap Command

The nmap command is a powerful network scanner that can help you identify active hosts on your network. Here's how to use it:

sudo nmap -sn 192.168.1.0/24
  • sudo: This grants root privileges for the command.
  • nmap: This is the network scanner command.
  • -sn: This option tells nmap to perform a "ping scan," which only checks for active hosts without attempting to identify open ports.
  • 192.168.1.0/24: This is the network range you want to scan. Replace this with your network's IP address range.

The output will show you a list of active IP addresses on your network.

2. Using the arp Command

The arp command displays the Address Resolution Protocol (ARP) cache, which maps IP addresses to MAC addresses. This can help you find IP addresses associated with devices on your network.

arp -a
  • arp: This is the ARP command.
  • -a: This option displays all entries in the ARP cache.

The output will show you a table of IP addresses and their corresponding MAC addresses.

3. Using the ip Command

The ip command provides a more detailed and advanced way to manage network interfaces and routing. To list all IP addresses on your network, use the following command:

ip addr show
  • ip: This is the network management command.
  • addr: This subcommand displays address information.
  • show: This option displays the current address configuration.

The output will show you a detailed list of all network interfaces and their associated IP addresses.

4. Using the ifconfig Command

The ifconfig command is a legacy command that displays information about network interfaces. While less common than ip, it can still be used to find IP addresses.

ifconfig

The output will show you details about each network interface, including its assigned IP address.

5. Using a Network Discovery Tool

There are several graphical network discovery tools available for Linux, such as:

  • NetworkManager: This is a built-in tool that provides a graphical interface for managing network connections. It can also display a list of devices on your network.
  • Wireshark: This is a powerful network analyzer that can capture and analyze network traffic. It can also display a list of devices on your network.
  • Angry IP Scanner: This is a free and open-source network scanner that can scan for active hosts and display their IP addresses.

These tools offer a more user-friendly way to find IP addresses on your network, providing additional information about each device.

Remember to consult your Linux distribution's documentation for specific command usage and available tools.

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