We pick i.root-servers.net, one of the 13 root servers (1), and ask it about nasaexplorers.org and learn that org is delegated to six name servers (2), so we ask d0.org.afilias-nst.org where we learn that nasaexplorers.org is delegated to three name servers, including ns1.nasa.gov (3), so we ask that one and get the following answer:
Nasaexplorers.org is a domain controlled by three domain name servers at nasa.gov having a total of six IP numbers. Some of them are on the same IP network.