titan.quantumart.ru has no NS records.
NS records for this zone are defined at quantumart.ru.
NS records for this zone are defined at quantumart.ru.
Question and response
Question
dig titan.quantumart.ru. NS
Answer
The response has no answer records.
Authority
quantumart.ru. 3600 SOA ns01.qdns.ru. it.quantumart.ru. 11342 3600 600 86400 3600
Additional
. 0 OPT ; payload 4000, xrcode 0, version 0, flags 0