There are numerous MAC Address Decoders that can help with this. If you know a MAC Address you can lookup who makes the device (as part of the address is assigned to individual hardware vendors. Once I configured it statically, everyone was happy. For some reason it started claiming IPs on it’s subnet. In the end, it was a small TP Link switch that had mgmt capabilities that I had never bothered to configure.

Now that I knew what port to look at, it was an easy task to track the device down. Now that I have the MAC Address of the rogue device, there is another PowerConnect command to show what interface that MAC Address is connected on show bridge address-tableĭon’t worry – the IPs and MAC Addresses have been changed to protect the innocent Logged into my PowerConnect switch, you can display the ARP table by executing show arp (Wireless) Select the ethernet interface on the left side. In order to display IP addresses, the hostname command can be used to select the -I option. The switch has ARP tables which help map out the IPv4 address to the link-layer where the MAC Address is relevant. The IP address or IP addresses of your Linux system can be determined using the hostname, ifconfig, and ip commands. A seasoned network engineer I am not but was able to figure it out within a few minutes. This particular subnet was wired-only, so I knew I could track it down. Obviously something was responding on that IP Address but I didn’t know what it was. I restarted the device but it did not resolve the issue. I went through a few troubleshooting steps and found that while I could ping it’s statically assigned IP – it did not show up in the Ubiquiti management console. I received an alert the other day that one of my Wireless APs had gone offline. It is an older but quite serviceable switch. My Homelab uses a Dell PowerConnect 6248 at it’s core. In this case, I figured out how to find the MAC Address of an errant device on my network using it’s IP Address. I hope they benefit others as well… Rogue IP Addresses can mess up the day We all perform steps that are only needed once in a while but when you need them – you really need them! I know they will help me. I”ll be using this category to document bits of knowledge that I don’t want to lose. Welcome to the inaugural post in my Before I Forget series.

How to find ip by mac address