We pick k.root-servers.net, one of the 13 root servers (1), and ask it about centrosociodigital.es and learn that es is delegated to seven name servers (2), so we ask ns-ext.nic.cl where we learn that centrosociodigital.es is delegated to two name servers, including dns2.cathedralsoft.com (3), so we ask that one and get the following answer: