You can make a Telnet by following the below mentioned steps:
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Open a command prompt in Windows:
1. Click Start > Run.
2. Type cmd.
3. Click OK. 
Note: To exit from the command prompt, type exit and press Enter.
In the command prompt window type:
telnet <domainname> <Port No> 
Press Enter.
Note: To exit out of the Telnet application type Ctrl + ], then type quit.
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Opening a command or shell prompt in Linux:
The exact method of doing this varies with the distribution and version of Linux operating system in use. 
If you are looking at a graphical screen, the most common method of getting to a shell prompt is to press Ctrl + Alt + F2. You may have to log in.
Note: To logout, type exit and press Enter. To return to the graphical interface, press Alt + F7.
Opening a command or shell prompt in Mac OS:

1. Click Finder.
2. Open the /Applications/Utilities folder by pressing Command + Shift + U.
3. Open the Terminal application.
Note: To exit from Terminal, type exit, press Enter then press Command + Q.
In the terminal, you can type the same command as typed in windows.
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