mailer.qsupport.ru has no NS records.
NS records for this zone are defined at qsupport.ru.
NS records for this zone are defined at qsupport.ru.
Question and response
Question
dig mailer.qsupport.ru. NS
Answer
The response has no answer records.
Authority
qsupport.ru. 600 SOA ns01.qdns.ru. it.quantumart.ru. 18480 14400 3600 2592000 600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0