With this, you have found the MAC address of a different device on your network. It will take some seconds for the results to show up, but once they do, you will see a list of the connected devices, their local IP addresses, their MAc addresses, and also their network names (if they have any). With the settings, you will have a maximum of 254 devices possible, but if it is a normal home network, you will most likely see 3-10 devices or something like that. This command will show you all the devices connected to the local network. sudo nmap -sn 192.168.0.1/24Ībove you should use the IP address of your gateway (router), and then the 24 is the correct number behind the slash if the subnet mask is 255.255.255.0. This will install Nmap on your computer, a fantastic program for running diagnostics on your device and your network. There might be changes here, but this is a quite normal way for it to look.īut, what can you do now? When you have this information in hand, do the following. Normally your IP address will look something like 192.168.0.104 and the subnet mask will look like 255.255.255.0. You will also see your local IP address on the internal network and the subnet mask. Now you will see a list of the network devices on your computer. Type the following command in the Linux command line. To get started, find your very own IP address. Find the MAC addresses of other devices on the same network as you. So, you expect to see a listing of IP addresses from the local network and, among these, your default router. #!/bin/bashįor dest in `arp -a | tail +5 | awk '' Note that these will all be local (same LAN) addresses since any connections for outside the local network will just go through the default router. The following script prints just the destination addresses (IP addresses or names) for which MAC addresses have been cached. address at the top of the list, for example, indicates that is a Cisco device. Using a tool like the one at, you can determine the manufacturer of each of the network interfaces listed.

The netmasks are all 255.255.255.255 since all the references are host-specific.

The network interface (there may be more than one) and each host the system is reaching through that interface and its physical address is listed. Other addresses may be static as well as the one indicated above, but these entries were picked up as a response to network traffic, not statically added to the table through a deliberate arp -s command. P = publish (i.e., explicitly added by an arp -s command)

In this display, the following flags have been used: S = static

How devices get their mac or ip address