Telnet Command In Linux

Chapter: Linux Commands Last Updated: 13-08-2019 03:40:30 UTC

Program:

            /* ............... START ............... */
                
$ telnet javascan.com 8080
Trying 104.31.93.139...
Connected to javascan.com.
Escape character is '^]'.

/* Above command telnet is used check whether the host is communicating with the specific port */

$ telnet javascan.com 22
Trying 104.31.92.139...
Trying 104.31.93.139...
Trying 2606:4700:30::681f:5d8b...
Trying 2606:4700:30::681f:5c8b...
telnet: Unable to connect to remote host: Network is unreachable

/* Port 22 is not opened for javascan.com and giving unable to connect message */

                /* ............... END ............... */
        

Output

Notes:

• Telnet Command Syntax : telnet [host] [port]
• Telnet command in linux is used to communicate with another host with Telnet Protocol.
• In telnet command you have to provide the host and port to connect to the protocol.
• If you are given any port which is not open for this host, telnet command will give message "Unable to connect to remote host: Network is unreachable".
• port number is optional, by default it goes to port 23.

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