Filtering
Ffuf provides the option to match or filter out a specific HTTP code, response size, or amount of words. We can see that with ffuf -h:
ffuf -hBetter VHost Fuzzing:
ffuf -w /opt/useful/seclists/Discovery/DNS/subdomains-top1million-5000.txt:FUZZ -u http://academy.htb:PORT/ -H 'Host: FUZZ.academy.htb' -fs 900