Cisco ASA

[fuzztester]

Pipe maskprocessor to -plus, and you can use rules.

Code:

mp64 -i ?d?d?d?d | -plus -m2400 -r usernames.rule hashfile

This above will brute-force all digits from length one to four, plus appending usernames to the guess.

Ah. Very nice. That will certainly do the trick. It does hinder the ability to guesstimate how long the job will take though.