f00f

F00f is a humorous and well-known term in the context of computer networking. It originated from a Windows driver bug that rendered the "f00f" string on screen when the operating system was unable to handle certain network packets. This condition was met when the low byte of a 16-bit port number was set to 0xF0.

The name "f00f" itself is a reference to the hexadecimal value F0F3, where F0 represents the binary value 11110000 and F3 is 111100011. In the Windows operating system, the driver responsible for the adapter would then use the typical "Function Not Implemented: f00f" display string, where a function of F0F3 is essentially impossible to handle, prompting the message.

Eventually, the term "f00f" became associated not just with the specific bug and its effects, but with devices that either advertise their ability to handle millions of combinations of numerical addresses, or are simple displays of prowess by the programmer.