mail.dtn.net.ua has no NS records.
NS records for this zone are defined at dtn.net.ua.
NS records for this zone are defined at dtn.net.ua.
Question and response
Question
dig mail.dtn.net.ua. NS
Answer
The response has no answer records.
Authority
dtn.net.ua. 600 SOA ns1.bestname.com.ua. domainmaster.bestname.com.ua. 2024101959 600 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0