We pick k.root-servers.net, one of the 13 root servers (1), and ask it about bol.es and learn that es is delegated to seven name servers (2), so we ask ns15.communitydns.net where we learn that bol.es is delegated to two name servers, including ns367672.ovh.net (3), so we ask that one and get the following answer:
Bol.es is a domain controlled by two domain name servers at ovh.net having a total of three IP numbers. All three of them are on different IP networks. Incoming mail for bol.es is handled by one mail server at bol.es themselves.