We pick e.root-servers.net, one of the 13 root servers (1), and ask it about opencomputerproject.org and learn that org is delegated to six name servers (2), so we ask d0.org.afilias-nst.org where we learn that opencomputerproject.org is delegated to two name servers, including a.ns.facebook.com (3), so we ask that one and get the following answer: