ns2.ru.eserver.net has no NS records.
NS records for this zone are defined at ru.eserver.net.
NS records for this zone are defined at ru.eserver.net.
Question and response
Question
dig ns2.ru.eserver.net. NS
Answer
The response has no answer records.
Authority
ru.eserver.net. 1800 SOA ns1.ru.eserver.net. hostmaster.eserver.ru. 1769713172 7200 3600 604800 1800
Additional
. 0 OPT ; payload 1680, xrcode 0, version 0, flags 0