Wireshark.

Wireshark is a full-blown network protocol analyzer that works as a powerful data sniffer. It displays the captured data packets and other network activity using a multi-colored, easy to read format. This is a very powerful program that’s aimed at system administrators, so I wouldn’t consider Wireshark ideal for novices. It’s still interesting to play with as you’ll get to see exactly what data your computer is sending and receiving in your online travels.
Having reached this paragraph, you’re expecting me to say that this program requires the WinPcap library. It does, but it comes bundled with the installer. So there.

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