Npcap 1.86 and SDK 1.16

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.

  
  

Npcap SDK 1.16 [2026-01-07]

• 
  

  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.