If I use a VPN, and visit any site on HTTPS, will the ISP know what sites I have visited? Because IP-addresses of websites are not encrypted?
And if the answer is yes, are there any ways to solve this problem?
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In short, No!
They see the IP of the VPN service and probably log it, and all your traffic including URL's IPs to your sites are encrypted. But if the VPN service is not encrypted, then the ISP could in theory can see all your traffic.
However, if you are using a
split tunneling mode, then the ISP can see your DNS queries and surfing traffic.
Read more about VPN, and be sure what mode you are using.