tgrdev.smrussia.su has no NS records.
NS records for this zone are defined at smrussia.su.
NS records for this zone are defined at smrussia.su.
Question and response
Question
dig tgrdev.smrussia.su. NS
Answer
The response has no answer records.
Authority
smrussia.su. 600 SOA ns1.masterhost.ru. hostmaster.masterhost.ru. 1764417302 28800 7200 1209600 600
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0