Telnet Connection Test Command Generator
Generate Telnet and TCP test commands for an IP address and port on your computer.
Commands to Run on Your Computer
Run locallyCopy a command and paste it into PowerShell or Terminal on your computer. The web page cannot open or run your terminal or read its result.
PowerShell (Windows · recommended)
This built-in Windows TCP test requires no extra installation. TcpTestSucceeded: True means the connection succeeded.
Netcat (macOS · Unix · recommended)
Available on macOS and most Unix environments. A succeeded or open message means the connection succeeded.
Telnet (Windows · macOS · Unix)
Use this when the telnet command or Windows Telnet Client is installed. A blank screen or cursor means it connected; press Ctrl+] then enter quit to exit.
Why Test from Your Computer?
A server-side test cannot reflect your computer's corporate network, VPN, router, or firewall conditions. This tool safely generates commands in the browser for you to run in your own terminal.
This page creates commands; it does not connect
The generated Telnet, PowerShell, or netcat command must run in a terminal on your own computer. That is useful because the result then reflects your local firewall, VPN, route, and private-network access rather than Utilook's network.
What an open port result proves
A successful TCP connection shows that the host and port accepted a connection from that location at that time. It does not verify the application protocol, authentication, response correctness, or security of the service behind the port.
Frequently Asked Questions
Will the button open Command Prompt or Terminal?
No. Browsers cannot open a terminal or execute a command automatically, so copy the command and paste it into your terminal.
What if Windows CMD says that telnet is not recognized?
Enable the Windows Telnet Client feature. Or use the PowerShell Test-NetConnection command, which needs no Telnet Client installation.
Can I test a private IP?
Yes. The command runs on your computer rather than the Utilook server, so you can test private IPs on a local network or VPN.