We pick j.root-servers.net, one of the 13 root servers (1), and ask it about 114.140.193.in-addr.arpa and learn that in-addr.arpa is delegated to six name servers (2), so we ask a.in-addr-servers.arpa where we learn that 193.in-addr.arpa is delegated to six name servers, including ns3.nic.fr (3), so we ask that one and learn that 140.193.in-addr.arpa is delegated to four name servers (4), so we ask ns3.ulakbim.gov.tr and learn that 114.140.193.in-addr.arpa is delegated to two name servers (5), so we ask ns1.osym.gov.tr and get the following answer:
The three name servers ns1, ns2 and ns3.osym.gov.tr together
There are five domains that use name server group 1.
All of those use the primary name server ns1.osym.gov.tr. Worth noting is that five of the domains that use the primary name server ns1.osym.gov.tr use name server group 1.
Four of them are reverse domain zones.
The primary name server ns1.osym.gov.tr only
Five of the six domains that use the primary name server ns1.osym.gov.tr use name server group 1. Worth noting is that all of the domains that use name server group 1 use the primary name server ns1.osym.gov.tr.