Is there some easy way to find out mac address of all machines on my network rather than doing an SSH into each and ifconfig grep HWaddr if there are 300 machines on network I really need some easy. How to find out mac addresses of all machines on network. For the MAC addresses I need to be root on my Ubuntu box. Hack into a computer through MAC and IP address [closed] Ask Question 4. NAT Mac address leak to Internet. How would a mac address be compromised?-4. Why are people developing and publishing games online without charging money?

In short the answer will be you can't. It is usually not possible for a person to get the MAC address of a computer from its IP address alone. These two addresses originate from different sources. Simply stated, a computer's own hardware configuration determines its MAC address while the configuration of the network it is connected to determines its IP address.

However, computers connected to the same TCP/IP local network can determine each other's MAC addresses. The technology called ARP - Address Resolution Protocol included with TCP/IP makes it possible. Using ARP, each computer maintains a list of both IP and MAC addresses for each device it has recently communicated with.