Wireshark

As the leading open-source network analysis solution, Wireshark offers comprehensive protocol decoding for both live network traffic and previously captured data. The software supports thousands of protocols and continuously adds new ones, making it invaluable for network troubleshooting, development, and education. Its intuitive interface allows users to examine minute details of network interactions, from basic connectivity issues to complex security incidents. Available across multiple platforms at no cost, Wireshark has become the standard tool for anyone needing to understand what's truly happening on their networks.