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The tool referred to as ARP poisoning, which is applicable for WiFi and Ethernet network reconnaissance, is bettercap. This is because bettercap is specifically designed as a powerful network attack and monitoring tool that facilitates ARP spoofing (or ARP poisoning), enabling attackers to intercept, manipulate, or redirect network traffic within a local area network. Its capabilities extend to both Ethernet and WiFi environments, making it versatile for reconnaissance tasks.

Bettercap also includes various modules for network attacks, sniffing, and real-time packet manipulation, which allows ethical hackers to test the security posture of networks effectively. The tool provides an intuitive interface and is widely used for its efficiency in conducting man-in-the-middle attacks, which leverage ARP spoofing to gather sensitive information from network traffic.

In contrast, the other tools mentioned serve different purposes: hping3 is a network tool mainly used for TCP/IP packet crafting and analysis, LOIC (Low Orbit Ion Cannon) is primarily used for stress testing and denial-of-service attacks, and Nbtstat is a Windows command-line tool used for troubleshooting NetBIOS over TCP/IP, which does not provide the same functionalities related to ARP poisoning or network reconnaissance.