We pick j.root-servers.net, one of the 13 root servers (1), and ask it about rotld.ro and learn that ro is delegated to six name servers (2), so we ask dns-ro.denic.de where we learn that rotld.ro is delegated to two name servers, including ns.rnc.ro (3), so we ask that one and get the following answer:
Rotld.ro is a domain controlled by two domain name servers at rnc.ro having a total of four IP numbers. Some of them are on the same IP network. Incoming mail for rotld.ro is handled by one mail server at rotld.ro themselves. Rotld.ro has one IP number (192.162.16.109), but the reverse is webapps2.rotld.ro.
There are about fourty domains that use the name server ns-a.rnc.ro.
One quarter of those use the two name servers ns-a and ns3.rnc.ro together, hereafter referred to as "name server group 1", (example: elibrarie.ro, show.ro and ciprian.ro ).