Is all data valid x86 16-bit machine code?

Question

Executing ndisasm /dev/urandom seems to never give me any errors. This suggests that I am either very lucky or all bytes really disassemble into 16-bit assembler.

I am facing an actual issue because I want to know if I can rely on this behavior to test my disassembler.

Answer 1

I think it is not all valid, cause I think ndisasm will output lines like db 0x82 when it doesn't match an instruction. Lines like that are there.