netkit-telnet

telnet.netkit

root@kali:~# telnet.netkit -h
telnet.netkit: invalid option -- 'h'
Usage: telnet.netkit [-4] [-6] [-8] [-E] [-L] [-a] [-d] [-e char] [-l user]
	[-n tracefile] [ -b addr ] [-r] [host-name [port]]

in.telnetd

root@kali:~# in.telnetd --help
in.telnetd: invalid option -- '-'
Usage: telnetd [-debug port] [-D (options|report|exercise|netdata|ptydata)]
	 [-h] [-L login_program] [-n]