Backslash is an escape character. You hashed nothing, and thus ended up with a null hash.
The actual nthash of a single backslash character is aa6827f0d30e81d0ece457e99188b6a8:
The actual nthash of a single backslash character is aa6827f0d30e81d0ece457e99188b6a8:
Code:
epixoip ~ $ echo -n '\' | iconv -t utf16le | openssl md4
(stdin)= aa6827f0d30e81d0ece457e99188b6a8