If i only have a part of the hash, am i able to use hashcat to list all the possible hashes from that hash? or is there any tool you guys can recommend?

for example i only have this hash -> ffffffff

i want to crack all hashes starting with this.

Any idea?

Actually i have the following:

a fixed string "fs" =12345abcd

random X

i want to find a random X such that h(fs|X) = start with 32 '1' bits which is ffffffff

Thanks! Smile
I think you are searching for a program to collide (collision) a hash. Hashcat is not made for this.