rs-notifier5.smailru.net has no NS records.
NS records for this zone are defined at smailru.net.
NS records for this zone are defined at smailru.net.
Question and response
Question
dig rs-notifier5.smailru.net. NS
Answer
The response has no answer records.
Authority
smailru.net. 300 SOA ns1.mail.ru. hostmaster.mail.ru. 3564333465 300 900 1209600 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0