Wireshark

Wireshark delivers professional-grade network analysis completely free of charge. This powerful software captures live network data and saves it for offline examination, enabling you to monitor network performance, debug protocol implementations, and conduct security assessments. With support for thousands of protocols and the ability to read capture files from many other network analyzers, Wireshark has become the standard tool for network troubleshooting across industries, backed by a vibrant global community of developers and users.