qf1.m.smailru.net has no NS records.
NS records for this zone are defined at m.smailru.net.
NS records for this zone are defined at m.smailru.net.
Question and response
Question
dig qf1.m.smailru.net. NS
Answer
The response has no answer records.
Authority
m.smailru.net. 300 SOA ns1.mail.ru. hostmaster.mail.ru. 3564347608 300 900 1209600 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0