riddlebox:~$ rfc -n
Must specify the port number/service that you're looking for!!
        rfc -n #/daemon local search for non-stanard service/port nums
        (BO Netbus etc)


riddlebox:~$ rfc -n netbus
Looking up service...
NetBus            12345/tcp  # NetBus backdoor trojan
NetBus            12346/tcp  # NetBus backdoor trojan