Hello, I've used the website http://www.canyouseeme.org/ to check if ports work, I randomly made up port numbers and they all Connection timed out, apart from ports such as 80, 25 etc.
Probably because they are closed as they should be to prevent people hacking into your system.
Is there any reason you need a particular port open?
You can open ports by configuring a port forwarding rule in your router.
Ports only show open if you have a listening device for that port.
Visiting a webpage does not open your computer up to port 80. In fact, the majority of outbound connections will likely change port numbers once the connection is made.
If you seen a responce saying that you had a lot of Open ports, then you should worry.
It's for a game I play, I want to be the host and host it but it requires ports, 30000, 30001