mx-fix.utk.RU has no NS records.
NS records for this zone are defined at utk.RU.
NS records for this zone are defined at utk.RU.
Question and response
Question
dig mx-fix.utk.RU. NS
Answer
The response has no answer records.
Authority
utk.RU. 900 SOA ns2.mts.RU. dns.mts.RU. 2026022601 10800 1800 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0