P0f

p0f
Developer(s)Michał Zalewski
Stable release
3.09b / 18 April 2016 (2016-04-18)
Written inC
Operating systemLinux, Macintosh, Microsoft Windows
TypeTCP/IP stack fingerprinting
Websitelcamtuf.coredump.cx/p0f3/

p0f is a passive TCP/IP stack fingerprinting tool. p0f can attempt to identify the system running on machines that send network traffic to the box it is running on, or to a machine that shares a medium with the machine it is running on. p0f can also assist in analysing other aspects of the remote system.