Nmap Packet Capture (NPcap)
NPcap is the Windows version of the libpcap library; it includes a driver to support capturing packets.
Wireshark can use this library to capture live network data on Windows.
General information about the NPcap project can be found at the NPcap web site.
The libpcap file format description can be found at: Development/LibpcapFileFormat
The (development) releases can be downloaded from https://github.com/nmap/npcap/releases. As it's still in development it's not considered stable at this time.
Npcap is the Nmap Project's packet sniffing library for Windows. It is based on the wonderful Winpcap / Libpcap libraries, but with improved improved speed, portability, security, and efficiency. In particular, Npcap offers:
- NDIS 6 Support
- Loopback Packet Capture