Wireshark lets the user put network interface controllers into promiscuous mode (if supported by the network interface controller), so they can see all the traffic visible on that interface including unicast traffic not sent to that network interface controller's MAC address. Wireshark is very similar to tcpdump, but has a graphical front-end and integrated sorting and filtering options.

Wireshark, and the other programs distributed with it such as TShark, are free software, released under the terms of the GNU General Public License version 2 or any later version. There is also a terminal-based (non-GUI) version called TShark. Wireshark is cross-platform, using the Qt widget toolkit in current releases to implement its user interface, and using pcap to capture packets it runs on Linux, macOS, BSD, Solaris, some other Unix-like operating systems, and Microsoft Windows. Originally named Ethereal, the project was renamed Wireshark in May 2006 due to trademark issues. It is used for network troubleshooting, analysis, software and communications protocol development, and education.

Wireshark is a free and open-source packet analyzer.

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