Help [HELP] how to find open port and free sites of my isp

I am from ethiopia and i want to make fbt

In my network their is no free site we can browse for free


So please help me how can i find my isp open port to use them on vpn apps

If i uae port scanner applications what can be my target ip
Which ip of my isp is to scan for open port

And how can i find free site of my isp

Please please please please my lovelly friends