mx1.rtcomm.ru has no NS records.
NS records for this zone are defined at rtcomm.ru.
NS records for this zone are defined at rtcomm.ru.
Question and response
Question
dig mx1.rtcomm.ru. NS
Answer
The response has no answer records.
Authority
rtcomm.ru. 10800 SOA ns01.rtcomm.ru. noc.rtcomm.ru. 2026012903 18000 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0