We pick e.root-servers.net, one of the 13 root servers (1), and ask it about nepentes.bg and learn that bg is delegated to six name servers (2), so we ask bg.cctld.authdns.ripe.net where we learn that nepentes.bg is delegated to two name servers, including czas.kraj.com.pl (3), so we ask that one and get the following answer: