Wireshark, a handy free packet sniffer

Wireshark is a handy free packet sniffer that captures packets passing along your network. Wireshark can be installed on Windows, Linux, Unix, and macOS. This system will capture packets passing along your network. It can scan wi-fi and Bluetooth as well as wired networks. The collected packets can be shown in the Wireshark dashboard and/or saved to file.