Enter an IP address, then the tool sends ARP in Broadcast, then Unicast Mode.

ARP Ping first pings an IP address on your LAN with a broadcast MAC address in the ARP packet. If an ARP response packet is received from the device, it continues to ping using the unicast ARP packet (by unicast we mean the target MAC address came from the first response to our broadcast).
 

Sends ARP in Broadcast Only Mode

ARP Ping pings an IPv4 address on your LAN with a broadcast MAC address ARP packet and continue to ping the IP Address with a broadcast targetted ARP packet.
 

Duplicate IP Address Detection

ARP Ping can search your LAN for duplicate IPv4 addresses using ARP packets sent to a specific IPv4 address. All responding MAC addresses are shown. Version 11.50 introduced a dedicated Duplicate IPv4 Scanning Tool.