We pick l.root-servers.net, one of the 13 root servers (1), and ask it about cebase.org and learn that org is delegated to six name servers (2), so we ask d0.org.afilias-nst.org where we learn that cebase.org is delegated to two name servers, including dns2.laisvas.lt (3), so we ask that one and get the following answer:
The two name servers dns1 and dns2.laisvas.lt together
There are about fourty domains that use name server group 1.
A third of those point only to the IP number 91.216.163.47. Worth noting is that half of the host names that point only to the IP number 91.216.163.47 use name server group 1.
Nine of them point only to the IP number 91.216.163.153.
Four of them point only to the IP number 91.216.163.132.
There are about thirty host names that point only to the IP number 91.216.163.47.
Half of those use name server group 1. Worth noting is that a third of the domains that use name server group 1 point only to the IP number 91.216.163.47.