How to get a list of all valid IP addresses in a local network?

Question

Is there a way to get a list of all valid IP addresses in a local network?

I mean all IP addresses that each user is using in the network.

http://superuser.com/questions/261818/how-can-i-list-all-ips-in-the-connected-network-through-terminal-preferably — Ciro Santilli OurBigBook.com, Sep 10 '15 at 08:30

score 503 · Accepted Answer · edited Aug 30 '19 at 09:37

503

Install nmap,

sudo apt-get install nmap

then

nmap -sP 192.168.1.*

or more commonly

nmap -sn 192.168.1.0/24

will scan the entire .1 to .254 range

This does a simple ping scan in the entire subnet to see which hosts are online.

edited Aug 30 '19 at 09:37

Lestrad

answered Dec 02 '12 at 13:46

Sunil Bojanapally

24

Per the man page "In newer releases of nmap, -sP is known as -sn". If the wildcard is not working, you can try something like nmap -sn 192.168.1.0/24 or nmap -sn 192.168.1.100-199 – Stickley Aug 10 '16 at 19:19
22

If you're using zsh, you will need to put quotes around the range to avoid file matching: nmap -sP '192.168.1.*' – dionyziz Dec 04 '16 at 11:37
Is there any chance nmap might crash or do any harm to any of the services or machines running in the subnet? – Jin Jun 27 '17 at 19:10
1

@Jin Izzraeel No chance of any harm being done. Can't say if it'll crash or not, but the chances are very slim. – Eric Thorbjornsen Jun 29 '17 at 01:10
1

nmap only finds my router. Is there a way to find all connected machines? – fishinear Nov 25 '17 at 15:23
2

if your smartdevice is ON, but its screen OFF, nmap will not find it. – bonobo Mar 06 '18 at 08:48
nice it work! can I also check more information on this specific ip address? – Dec 15 '18 at 17:58
On Mac OSX on an Android phone hotspot the only way that found the other connected IP address was with double-verbose mode: `nmap -sn -vv 192.168.1.0/24` – Tybion Jun 24 '20 at 23:13
Is there an equivalent of this for the IP command? – Wade John Beckett Oct 03 '21 at 20:52
@Sunil Bojanapally thanks for the simple and working answer – Harjeevan Tanda Nov 30 '22 at 05:14

score 410 · Answer 2 · edited Nov 01 '22 at 11:16

410

Try following steps:

Type ipconfig (or ifconfig on Linux) at command prompt. This will give you the IP address of your own machine. For example, your machine's IP address is 192.168.1.6. So your broadcast IP address is 192.168.1.255.
Ping your broadcast IP address ping 192.168.1.255 (may require -b on Linux)
Now type arp -a (apt install net-tools). You will get the list of all IP addresses on your segment.

edited Nov 01 '22 at 11:16

malat

answered Mar 12 '13 at 00:19

Virendra

4

it doesn't work on my PC (windows 8) – phuclv Mar 25 '14 at 11:30
8

This worked on my mac - OSX 10.10.3 – Cullub Apr 18 '15 at 16:46
1

For me, on Ubuntu Linux, I typed `ifconfig` instead of `ipconfig` to get this to work. – JW. May 06 '16 at 15:52
31

a lot of device not founded – Bagusflyer May 31 '16 at 03:50
11

arp -a only found my router. nmap found all the hosts. – Geoffrey Anderson Dec 06 '16 at 01:18
2

Microsoft Windows [Version 10.0.15063] worked perfect thank you – Coty Embry Jun 10 '17 at 23:53
1

This doesn't work on ubuntu-16.04 – Aspire Jan 30 '18 at 11:57
7

This answer could be improved with explanations for steps 2 and 3. What do these commands do (e.g. why do I need to ping my broadcast IP?)? What does arp do? Do I have to do step 2 before step 3? If so, why? – Patrick Dec 18 '18 at 08:21
now we may use `ip route` instead ipconfig – Sérgio Feb 11 '19 at 22:12

score 29 · Answer 3 · edited May 17 '20 at 20:46

29

If you want to see which IP addresses are in use on a specific subnet then there are several different IP Address managers.

edited May 17 '20 at 20:46

Volker Siegel

answered Dec 02 '12 at 22:51

3 Answers3