How to list all active IP addresses in the network from Linux command line

Linux Tutorial – Hello everyone, today I am going to show you how to list all active IP addresses in the network via command line. I am using Ubuntu Linux on this tutorial, but it should be the same for other Linux distribution. In order to display all used IP address on the network, we can use an application called arp-scan. This program can be downloaded and installed on most Linux distribution.

First, we need to install arp-scan package. If you are on Ubuntu, you can use the following command to install arp-scan.

sudo apt install arp-scan

Then, we can start scanning our network with the following command

sudo arp-scan --interface=wlp3s0 --localnet

Change wlp3s0 with your network interface. If you don’t know the network interface you are using, execute this command

ifconfig

wlp3s0    Link encap:Ethernet  HWaddr dc:53:60:b5:85:6f  
          inet addr:10.34.0.232  Bcast:10.34.0.255  Mask:255.255.255.0
          inet6 addr: fe80::4a93:7b7:f25a:afee/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:36453 errors:0 dropped:0 overruns:0 frame:0
          TX packets:18395 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:29241254 (29.2 MB)  TX bytes:2878177 (2.8 MB)

Now scan the network using arp-scan

dhani@dhani-ThinkPad-T450:~$ sudo arp-scan --interface=wlp3s0 --localnet
Interface: wlp3s0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.8.1 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
10.34.0.5	00:18:8b:3b:3c:47	Dell
10.34.0.100	5c:d9:98:4b:f6:fc	D-Link Corporation
10.34.0.227	00:16:6c:8d:88:69	Samsung Electonics Digital Video System Division

34 packets received by filter, 0 packets dropped by kernel
Ending arp-scan 1.8.1: 256 hosts scanned in 1.259 seconds (203.34 hosts/sec). 34 responded