mx.FIORD.RU has no NS records.
NS records for this zone are defined at FIORD.RU.
NS records for this zone are defined at FIORD.RU.
Question and response
Question
dig mx.FIORD.RU. NS
Answer
The response has no answer records.
Authority
fiord.ru. 86400 SOA ns1.fiord.ru. noc.fiord.ru. 2026021900 14400 1800 2592000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0