If I block
Then it is blocked and user can't go to this website
But he can by typing it's ip address 188.8.131.52.
The purpose of a DNS is to translate a URL, a domain name, into an ip address, if google.com is blocked, then the user cannot know the ip address of the blocked site. Unless he knows it by heart
So we can also say nextDNS also supports blocking of ip address (if doesn't know by heart)
DuKe no. If you want to block IP addresses you need a firewall
Name of the firewall and how do I use?