If need be, you can find your own IP address through Terminal, System Preferences, or by using an outside service if you’re looking for the external address. You can ignore the protocol suggestion at the end of the arp results, in this example despite the devices showing as “ethernet”, they’re actually all on a wireless network with wi-fi on the en0 interface.ĭo note that you will not see the Macs own IP address or MAC address in this list. Note in this example that 192.168.0.10 is a fresh IP compared to the prior results, as that machine just joined the network. If the output doesn’t look up to date, or if it’s missing an IP you believe should be there, ping the broadcast IP (typically the last result of arp -a ending with “.255”), then run arp -a again like so. ? (192.168.0.255) at ff:ff:ff:ff:ff:ff on en0 ifscope How to Find IP Addresses of Devices on a Local Network with ping & arp (For the latter, you can help distinguish hardware by matching them up to the MAC address found in MacOS X or in iOS).Īn example of arp -a output looks like this: This will return devices found on the local network, including other Macs, PCs, routers, iPhones, and iPads, displaying both their LAN IP address as well as their individual MAC address. For the purposes we want to achieve here, the most simple use of arp is with an -a flag attached: The arp tool is uses ARP (Address Resolution Protocol) to display and control network address resolution functions. To get started, launch the Terminal app from /Applications/Utilities/ (or accessed with Spotlight and Command+Spacebar).

How to find ip by mac address