We pick b.root-servers.net, one of the 13 root servers (1), and ask it about rcsrds.ro and learn that ro is delegated to six name servers (2), so we ask dns-at.rotld.ro where we learn that rcsrds.ro is delegated to two name servers, including ns2.rdsnet.ro (3), so we ask that one and get the following answer:
Rcsrds.ro is a domain controlled by two domain name servers at rdsnet.ro. Both are on the same IP network. Incoming mail for rcsrds.ro is handled by three mail servers also at rdsnet.ro having a total of two IP numbers. Two mail servers have the same IP number. Both are on different IP networks. We are missing the IP:s of one server: mx2.rdsnet.ro. Rcsrds.ro has one IP number (81.196.12.81), but the reverse is 81-196-12-81.rdsnet.ro.
Ten of them use the name server ns1.rdsnet.ro. Worth noting is that ten of the domains that use the name server ns1.rdsnet.ro point to the IP number 81.196.12.81.