_net2.coordinator.ua has no CNAME records.
Question and response
Question
dig _net2.coordinator.ua. NS
Answer
The response has no answer records.
Authority
coordinator.ua. 3600 SOA ns.net.ua. hostmaster.eunic.net.ua. 2026010101 3600 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0