How to see all computers connected to a network

Question

I am in a LAN and there are 3 Ubuntu, 2 Kubuntu, 2 Windows XP and 2 Windows 7. What commands or tools are available to see what PCs are connected to the LAN that it shows the name of the PC and the IP. Similar to tools like Angry IP that show all PCs in a LAN.

Note that I do not know the IPs or names of the computers connected to the LAN. So the tool or command should look for them to.

http://superuser.com/questions/261818/how-can-i-list-all-ips-in-the-connected-network-through-terminal-preferably — Ciro Santilli OurBigBook.com, Nov 30 '15 at 11:30
None of the answers actually answers the question for me on Ubuntu 18.04 and a school LAN. — mLstudent33, Jul 02 '20 at 15:08

Manuel · Answer 1 · 2015-02-23T07:02:56.013

65

Arp-scan works great for me too...

If using Wi-Fi:

sudo arp-scan -l --interface=wlan0

-or if using ethernet:

sudo arp-scan -l --interface=eth0

(this last is practically identical to what Rajesh Rajendran posted; the -l standing for --localnet)

If you don't have arp-scan (it doesn't come with Ubuntu by default), just pull up a terminal and type:

sudo apt-get install arp-scan

edited Feb 23 '15 at 07:02

answered Feb 23 '15 at 05:09

Manuel

769

4

If this doesn't work use ifconfig to get a list of interfaces and try switching eth0 to something else. – Philip Kirkbride Apr 21 '17 at 15:29
1

It's not showing any IPs for me. ```sudo arp-scan -l --interface=wlp4s0 Interface: wlp4s0, datalink type: EN10MB (Ethernet) Starting arp-scan 1.9.5 with 256 hosts
14 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.9.5: 256 hosts scanned in 1.975 seconds (129.62 hosts/sec). 0 responded```
– Philip Rego Feb 04 '20 at 01:56
how do I find the correct wifi interface? Mine is not wlan0 – mLstudent33 Jul 02 '20 at 15:11
arp-scan don't exist in Ubuntu 20.xx so this article are out of date and are only confusing people. – Stefan von straten Finne Aug 21 '21 at 07:56
You can also sudo lshw -c network to see all your network interfaces – Chad Jan 28 '22 at 20:15
@mLstudent33 It should be something like wlp2s0 Run iwconfig and it should be the last on the list. – mchid Feb 09 '22 at 11:05

score 54 · Accepted Answer · edited Feb 23 '15 at 06:28

54

Taken from Finding All Hosts On the LAN From Linux/Windows Workstation

for ip in $(seq 1 254); do ping -c 1 192.168.1.$ip>/dev/null; 
    [ $? -eq 0 ] && echo "192.168.1.$ip UP" || : ;
done

But for a great tool, Nmap. Great for mapping networks.

edited Feb 23 '15 at 06:28

αғsнιη

35,660

answered Nov 25 '11 at 02:23

rdh

866

2

this would work only when the subnet is using /24 addressing. – Vineet Menon Nov 25 '11 at 05:29
7

+1 That's a pretty spiffy little IP address scanner. – Evan Plaice Aug 15 '12 at 06:08
Your local IP may be very different than this... – JohnAllen May 18 '17 at 18:50
This only shows my default gateway IP – Philip Rego Feb 04 '20 at 01:53

score 49 · Answer 3 · edited Oct 25 '21 at 16:18

49

The simplest thing is

$ sudo arp-scan --localnet

edited Oct 25 '21 at 16:18

Deepak Kumar Singh

117

answered Jul 02 '14 at 12:56

Rajesh Rajendran

1,107
9
18

9

arp-scan -l does the same thing. – ki9 Nov 07 '16 at 03:35
I want a list of all the hosts. This doesn't do that. – mLstudent33 Jul 02 '20 at 14:55
I get ERROR: Could not obtain MAC address for interface tun0 – aquirdturtle Feb 13 '22 at 06:36

score 37 · Answer 4 · edited Oct 13 '20 at 16:15

37

I always use nmap. To scan for all devices in your network, use:

nmap -sP 192.168.0.1/24

More here: https://www.cyberciti.biz/networking/nmap-command-examples-tutorials/

It is a great tool to know about. You may want to install nmap using:

sudo apt-get install nmap if you are using Debian or

sudo pacman -S nmap if you are using Arch.

edited Oct 13 '20 at 16:15

Matthias Braun

1,043

answered Feb 23 '15 at 06:35

Ruraj

942
9
9

What do to For Fedora? – supershnee Aug 27 '17 at 09:40
@supershnee Do a yum install nmap – Ruraj Oct 27 '17 at 17:41
And now for Fedora 25 and + : dnf install nmap will install nmap – BendaThierry.com Apr 03 '18 at 12:51

score 17 · Answer 5 · answered Aug 18 '14 at 04:48

17

As a possible GUI option, the best one I have seen is Angry IP as found in http://angryip.org/download/#linux

Simply download the latest DEB package and install. Then run ipscan from Dash. Here is a screenshot:

enter image description here

answered Aug 18 '14 at 04:48

Luis Alvarado

211,503

does it filter only linux machines, if yes please guide me how. – khanthegeek Apr 14 '15 at 13:55
1

it is really good, I added all fetchers to the list columns, what helped most were hostname and macvendor, now everything connected to my wifi is more understandable, thx! – Aquarius Power Oct 31 '16 at 23:45
is wire shark better for tasks like this? how about kali linux? – mLstudent33 Jul 02 '20 at 15:12
@AquariusPower Where does one find the macvendor feature? – Jeff Ward Jan 05 '22 at 23:20
1

@JeffWard menu: tools/fetchers//availableFetchers//"lastItemOnTheList", then sort by macvendor, it is a short name of the hardware like D-Link – Aquarius Power Jan 06 '22 at 02:12

score 10 · Answer 6 · answered Apr 03 '17 at 21:58

arp

Address                  HWtype  HWaddress           Flags Mask            Iface
iPhone-von-me.fritz.box  ether   12:55:05:30:3c:df   C                     wlp3s0
android-abcdefghijklmno  ether   11:66:3f:71:04:d6   C                     wlp3s0
fritz.box                ether   00:11:3f:46:37:c2   C                     wlp3s0
Blupiblu.fritz.box       ether   71:88:cc:bb:dc:a6   C                     wlp3s0

ip neigh

ip neigh and hosts. NO nmap / sudo required.

Building on this, you can build a Python script:

#!/usr/bin/env python

"""List all hosts with their IP adress of the current network."""

import os

out = os.popen('ip neigh').read().splitlines()
for i, line in enumerate(out, start=1):
    ip = line.split(' ')[0]
    h = os.popen('host {}'.format(ip)).read()
    hostname = h.split(' ')[-1]
    print("{:>3}: {} ({})".format(i, hostname.strip(), ip))

Download via

wget https://gist.githubusercontent.com/MartinThoma/699ae445b8a08b5afd16f7d6f5e5d0f8/raw/577fc32b57a7f9e66fdc9be60e7e498bbec7951a/neighbors.py

the only output was: 1: _gateway. (207.23.10.xx4) where xx are digits — mLstudent33, Jul 02 '20 at 14:57

score 7 · Answer 7 · answered Aug 15 '12 at 06:20

If broadcast isn't disabled on your router...

You can ping the broadcast address.

ping -b 192.168.0

Will broadcast the ping command to every host within the 192.168.0/24 subnet.

Note: It's probably a good idea to keep broadcasting turned off though as that's how hackers can exploit a network using a DDOS Smurf attack. Basically, ping the broadcast address with a packet that has a spoofed destination address (ie the ip address of the victim). There's a little more to it than that but that's what Google is for.

Note: The same also works on Windows but you ping the actual broadcast address (not the subnet).

ping -b 192.168.0.255

score 3 · Answer 8 · edited Aug 21 '21 at 17:29

3

Nmap is your friend

nmap -sP 192.168.0.1/24

If you have any question, nmap help is full of information.

edited Aug 21 '21 at 17:29

Zanna

70,465

answered Mar 09 '17 at 11:35

craken

196

score 0 · Answer 9 · answered Jun 08 '21 at 04:51

Script to send email in Shell and Powershell where it is asked to user credentials when you run the script.
Script to check online devices in the network for both Linux and Windows Clients.
Script to check disk space of devices detected by previous script for both Windows and Linux.

How to see all computers connected to a network

9 Answers9

arp

ip neigh

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