Main Options
Telnet has a simple structure and does not have many options. It is mainly used to specify the target and port for connection.
1. Basic Connection
Generated command:
Try combining the commands.
Description:
`telnet` Executes the command.
Combine the above options to virtually execute commands with AI.
Installing Telnet
Most modern Linux distributions do not come with `telnet` installed by default due to security issues. You need to install it manually if you want to use it for tasks like checking ports. Using SSH is much safer for security.
Debian/Ubuntu
sudo apt update
sudo apt install telnetHow to install the telnet client on Debian or Ubuntu-based systems.
CentOS/RHEL/Fedora
sudo yum install telnetHow to install the telnet client on CentOS, RHEL, or Fedora-based systems.
Arch Linux
sudo pacman -S telnetHow to install the telnet client on Arch Linux.
Commonly Used Examples
Learn how to use `telnet` to check if a remote server's port is open. This is primarily useful for troubleshooting network issues.
Check Web Server Port (80)
telnet example.com 80Checks if port 80 (HTTP) is open on a specific host.
Check SSH Port (22)
telnet example.com 22Attempts to connect to port 22 (SSH) on a remote server.
Check FTP Port (21)
telnet ftp.example.com 21Connects to port 21 on the FTP server to check for a response.
Check SMTP Server Port (25)
telnet mail.example.com 25Connects to port 25 (SMTP) on the mail server to check for a response.
Connection Result
If the connection is successful, the cursor will blink with the message 'Connected to [host]'. If the connection fails, messages like 'Connection refused' or 'No route to host' will be displayed. To terminate the connection, press `Ctrl + ]` and then type `q`.