[ktm5j]

Yeah it's an easy way to check if a port is responding, and you can actually drive some protocols using telnet.

Eg: `telnet some.http.addr 80` and then type in `GET /index.html HTTP/1.0` and hit enter twice.

You can use it to test SMTP servers too.

[vonunov]

https://i.vgy.me/JuGzDb.png (user input marked)