mail.smartactive.ru has no NS records.
NS records for this zone are defined at smartactive.ru.
NS records for this zone are defined at smartactive.ru.
Question and response
Question
dig mail.smartactive.ru. NS
Answer
The response has no answer records.
Authority
smartactive.ru. 10800 SOA ns1.reg.ru. hostmaster.ns1.reg.ru. 1759736962 14400 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0