I have several linux devices connected to the same router (of which I am not a administrator). How can I find out the ip addresses of all other devices by executing some commands in one of them?
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related (with links to a lot of duplicate quesions): How can I list all IPs in the connected network, through Terminal preferably? – Alexander Malakhov Oct 22 '16 at 09:24
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If this is a router and not a switch, I'm not sure if you can. A router doesn't pass broadcasts by default, and each device might be on a different subnet, so arp/nmap/fing/ping might be useless. – Dani_l Dec 16 '18 at 11:19
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I believe you could use nmap to get such information.
The below command lists me all the machines/devices connected in my network. It is a home network and it lists me all the machines in my home.
nmap -sP 192.168.1.0/24
I believe you need to modify the subnet mask and IP range that you are in to suit your requirements.
Ramesh
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nmap -sA 192.168.1.0/24nmap option-sAshows similar descriptive results with better readability, which includes device name, IP, mac, etc as with option-sP. I personally prefer-sAover-sPfor the readability sake. – Jay Feb 03 '16 at 10:17 -
2@Tarlo_x https://superuser.com/questions/970380/so-what-does-24-have-to-do-with-255-in-hosts-ip-addresses – Alessandro Jacopson Sep 02 '18 at 09:30
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For a more compact list of connected devices:
nmap -sL 192.168.0.* | grep \(1
Explanation
nmap -sL 192.168.0.* will list all IPs in subnetwork and mark those, that have name:
Nmap scan report for 192.168.0.0
Nmap scan report for Dlink-Router.Dlink (192.168.0.1)
Nmap scan report for 192.168.0.2
...
Nmap scan report for android-473e80f183648322.Dlink (192.168.0.53)
...
Nmap scan report for 192.168.0.255
As all interesting records contain parenthesis ( and digit 1, we filter for that with | grep \(1 (backslash is needed to escape parenthesis)
Quirk
Beware that if two devices have the same name, nmap will show only the one, that was connected to router last
