npm

arping

Check if MAC addresses are already in use on a LAN

brewmacoslinux
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Source

About

Utility to check whether MAC addresses are already taken on a LAN

Commands

arping

Examples

Check if a specific IP address is already taken on the network$ arping -c 1 192.168.1.100
Find the MAC address of a device by its IP address$ arping -c 1 -r 192.168.1.50
Send ARP requests on a specific network interface$ arping -c 2 -I en0 192.168.1.1