What is the max possible size of an 32x32px .ico file?

Question

I'm making a favicon.ico script, and I need to know the max amount of bits possible.

Answer 1

It maxes out at 32 bits per pixel, 24 RGB plus alpha transparency, so that would be 32 x 32 x 32, or 32768 bits.

So 4096 bytes (4K).