The 1.3 version of ArpSpyX for Mac was available to download on the developer's website when we last checked. We cannot confirm if there is a free download of this app available. This free Mac app is an intellectual property of Allen Porter. The bundle id for this app is org.thebends.ArpSpyX.
Please check the Mac app with an antivirus before launch as it is downloaded from the developer's website, and we cannot ensure that it is safe. The most popular versions of ArpSpyX for Mac are 1.3, 1.2 and 1.1. The program lies within Internet & Network Tools, more precisely Network tools. ArpSpyX-1.3.zip is the most frequent filename for this program's installer.
From the developer:
Arp packets are an indicator of what machines are active on your network. ArpSpyX will passively sniff your network for ARP packets and display the IP and MAC address of the machine that generated the packet.
ArpSpyX supports two methods of scanning. The first method is a passive mode which will only listen for traffic without sending any packets.
You may want to check out more software for Mac, such as Lighthouse, Throttled Pro or HippoVNC, which might be related to ArpSpyX.