mail.cave.kiev.ua has no NS records.
NS records for this zone are defined at cave.kiev.ua.
NS records for this zone are defined at cave.kiev.ua.
Question and response
Question
dig mail.cave.kiev.ua. NS
Answer
The response has no answer records.
Authority
cave.kiev.ua. 1800 SOA noah.ns.cloudflare.com. dns.cloudflare.com. 2399298138 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0