Wireshark

Wireshark is the world's most widely used open-source network protocol analyzer, relied upon by network engineers, cybersecurity professionals, forensic investigators, and educators globally for deep packet inspection, network troubleshooting, and security analysis. Operating at the foundational packet level, Wireshark captures live network traffic passing through network interfaces across Ethernet, Wi-Fi, Bluetooth, and virtual switches, displaying the raw bitstreams and reconstructed protocol fields in an intuitive graphical interface. The software features an expansive library of protocol dissectors capable of decoding thousands of networking protocols across the entire OSI model, from low-level Ethernet frames and TCP/IP packets to high-level application protocols like DNS, HTTP, SMB, and TLS. Wireshark's sophisticated display filter language allows analysts to isolate specific communication flows, identify malformed packets, uncover network latency bottlenecks, and reconstruct TCP conversations into readable data streams. In cybersecurity operations, Wireshark serves as an indispensable tool for forensic investigations, enabling defenders to analyze malware command-and-control communications, detect network port scans, verify encryption implementations, and investigate data exfiltration incidents. Wireshark remains the gold standard in deep packet inspection and network protocol visibility.