nmap/npcap v1.86 on GitHub

Installer and SDK available from https://npcap.com/#download .

Npcap 1.86 [2026-01-07]

Updated libpcap to 1.10.6. For a summary of the last 18 years of libpcap
features that have been added since the libpcap 1.0.0 release that WinPcap is
stuck on, check out the What's New page on npcap.com.
Fix a BSoD crash (DRIVER_IRQL_NOT_LESS_OR_EQUAL) in bpf_filter() caused
by the filter program being freed and overwritten while a packet is being
processed. Fixes #819.
Fix issues with placement/deletion of Uninstall.exe and DriverQuery.exe.
Fixes #821.
Fix a deadlock in Packet.dll preventing applications from starting when Npcap
is installed in /admin_only mode. Npcap 1.84 and 1.85 were affected.
Fixes #813.
Fix a BSoD crash (KMODE_EXCEPTION_NOT_HANDLED) when capturing injected
packets. Fixes #815.
Fix an incompatibility that prevented Npcap 1.81 through 1.85 from being able
to capture when installed with the /prior_driver=yes option on versions of
Windows before Windows 10. This issue does not affect any version of Windows
that is supported by Microsoft. Fixes #822.

Upgraded libpcap to 1.10.6.
Renamed the SKF_AD_* constants to NPCAP_AD_* to avoid confusion with code
that may expect the same values or ordering as the constants defined by
Linux. The old names are still conditionally defined for convenience.
Defined additional modes for PacketSetMode()/pcap_setmode():
MODE_SENDTORX and MODE_SENDTORX_CLEAR to enable and disable the SendToRx
feature independent of systemwide Registry setting.
Requires Npcap 1.83 driver or later.
Enable nanosecond-precision timestamps on a packet handle using
PACKET_MODE_NANO with PacketSetMode(). Requires Npcap 1.83 driver or later.
Added new constants for PacketGetInfo(): NPF_GETINFO_MODES returns
supported mode bits for PacketSetMode(). NPF_GETINFO_STATS retrieves
performance statistics for the filter module. NPF_GETINFO_MODDBG gets
internal debugging info unique to a filter module. These require Npcap 1.84
driver or later.