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Firstly, I want to thank you as finally I found IP addresses that were connected to my modem. I found out all 5 devices that were connected to my modem using nmap, while it was showing only 2 devices before scanning. I want to find their mac address and remove those devices from my Wi-Fi using Gnome-Terminal. I am able to do this using modem interface but I want to work on Ubuntu and learn Linux, so I want to do this using Terminal. İs it possible? If yes, please tell me how?

m.tuğrul
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3 Answers3

3

You can use nmap with any of several options. The machines must be on the same LAN, no router in between.

  • nmap -sP
  • nmap -sn
  • nmap -sL
  • nmap -PU

See man nmap and / or: https://nmap.org/book/man-host-discovery.html

andrew.46
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Panther
  • 104,528
2

If you are interested in using something other than nmap, there is also a tool called tuxcut that lets you scan and block other devices's MAC address connected to the same LAN as yours.
Find the tool here.

Sandeep Neupane
  • 499
2

An alternative to nmap would be arp-scan. It's reasonably fast and does give mac addresses. The only limitation it has is that it is only for IPv4 addresses, but for a home network as in your case, this will be OK.

Sample output:

xieerqi:$ sudo arp-scan --interface=eth0 147.153.173.0/24   
Interface: eth0, datalink type: EN10MB (Ethernet)
Starting arp-scan 1.8.1 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/)
147.153.173.1   3c:df:1e:8c:ed:40   Cisco Systems
147.153.173.16  34:17:eb:c0:21:0f   (Unknown)
147.153.173.20  34:17:eb:c1:29:3e   (Unknown)
147.153.173.21  00:17:f2:05:cb:cc   Apple Computer
147.153.173.21  00:17:f2:05:cb:cc   Apple Computer (DUP: 2)
147.153.173.22  bc:30:5b:d8:9f:ea   Dell Inc.
147.153.173.23  00:22:19:2d:7b:33   Dell Inc
147.153.173.24  34:17:eb:c0:56:cb   (Unknown)
147.153.173.29  34:17:eb:c0:21:76   (Unknown)
Sergiy Kolodyazhnyy
  • 107,582