yes that would be telnet using the default port of 23 - you can specify any port you want - if the end host is listening it will connect - so in this case it will have a web server which will run on port 80 (http) - if the screen goes blank it has connected - for http you can then send commands for instance "/GET" will bring you back the default web page (in text format) - other protocols you can also do the same e.g SMTP but more complex applications will connect then probably error as they expect some application data, but it still prves the application is listening
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