mx03.NICMAIL.RU has no NS records.
NS records for this zone are defined at NICMAIL.RU.
NS records for this zone are defined at NICMAIL.RU.
Question and response
Question
dig mx03.NICMAIL.RU. NS
Answer
The response has no answer records.
Authority
NICMAIL.RU. 600 SOA ns3-l2.nic.RU. info.nicservice.RU. 2019112532 14400 3600 2592000 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0