Note: The -t 4 flag limits tasks to 4 parallel threads, reducing the risk of crashing the target FTP service or tripping local firewall rate-limiters.

: For massive lists, pipe the output directly into your testing tool (like Hydra or Medusa) to save disk space. DEV Community

awk 'length($0) >= 8 && length($0) <= 20' input_list.txt > filtered_ftp_list.txt Use code with caution. Applying Custom Rules with Hashcat