Unbreakable hashes

I've tried to brute force 2 hases from IP.board 3.4.6 in last 5 weeks it got to 15 characters and still nothing , also no wordlist helped me. Maybe are uncrackable or something like that? Anyone around knowing ipb hash system? So that tell me if i waste time for nothing or not
also, do some one have a around 30 GB wordlist?