RPi4はarp-scanで3b/3b+と違って Raspberry Pi Foundation ってこない気がする。
mocha@hoto:~$ sudo arp-scan --interface wlp5s0 -l Interface: wlp5s0, datalink type: EN10MB (Ethernet) Starting arp-scan 1.9 with 256 hosts (http://www.nta-monitor.com/tools/arp-scan/) 192.168.1.1 10:4b:46:e7:50:94 (Unknown) 192.168.1.17 50:d4:f7:cd:a9:7c (Unknown) 192.168.1.18 b8:27:eb:c7:1a:58 Raspberry Pi Foundation 192.168.1.19 b8:27:eb:c7:1a:58 Raspberry Pi Foundation 192.168.1.25 b8:27:eb:ee:38:fa Raspberry Pi Foundation 192.168.1.25 b8:27:eb:ee:38:fa Raspberry Pi Foundation (DUP: 2) 192.168.1.52 b8:27:eb:bd:18:4b Raspberry Pi Foundation 192.168.1.44 dc:a6:32:6c:cb:54 (Unknown) 192.168.1.240 58:38:79:27:99:b0 (Unknown) 192.168.1.19 b8:27:eb:92:4f:0d Raspberry Pi Foundation (DUP: 2) 10 packets received by filter, 0 packets dropped by kernel Ending arp-scan 1.9: 256 hosts scanned in 2.408 seconds (106.31 hosts/sec). 10 responded
192.168.1.44がRPi4