New-ish Asus routers [CORRECTION: at least two routers bought in Sweden] seem to enable "Yandex.DNS" by default. This forwards all of your DNS lookups to Yandex, a large Russian search engine. I discovered this on my dad's router when he had troubles accessing his bank from his broadband but not on his phone. (Presumably, the bank geoblocked Russian IPs as a protest to the invasion of Ukraine.)
I get that you need to trust someone with your DNS lookups (your ISP, Google, Cloudfare, etc), but I didn't expect the non-ISP option to be the default...
Check your router!
@raek are you sure it was that way from the factory and that model was not designed for Russian market which essentially covers all post USSR countries. UI on that screenshot is not consistent with their ZenWiFi UI where they moved Parental control, then even on old UIs Parental control designed to have web filter and time limit options, lastly DNS was always under WAN. So either old firmware got exploited or some one configured parental controls that way or it came with some service.
