Wireshark

Wireshark stands as the premier free and open-source solution for network protocol analysis, trusted by professionals worldwide. It captures live network data or reads from capture files, then presents detailed protocol information in an accessible interface. Users can drill down into individual packets, follow TCP streams, and export session data for further analysis. The application supports hundreds of protocols and file formats, making it exceptionally versatile for troubleshooting, security analysis, protocol development, and educational purposes across diverse network environments.