use the terminal
Matthews-MacBook-Pro-4:~ matthewgosling$ telnet 10.1.1.1
Trying 10.1.1.1...
telnet: connect to address 10.1.1.1: Connection refused
telnet: Unable to connect to remote host
Matthews-MacBook-Pro-4:~ matthewgosling$
I also use SecureCRT, but its not free.