Is that related to a text file (that I don't recall) that listed sites and IP numbers? I remember editing such a file a couple of computers and several OS upgrades ago.

Back to routers, do most routers allow the router's administrator to edit a list DNS servers? (Looking at my router's web interface, I see a page called Static Routing where I can apparently add server, although I wouldn't know what subnet mask to use.)

More importantly, I have added the Cloudfare servers in my computer's network settings. Does that mean the Cloudfare servers get used even if they are not listed in the router's list of DNS servers? Thanks for the continuing education.