sweeper.i.kyivstar.net has no NS records.
NS records for this zone are defined at i.kyivstar.net.
NS records for this zone are defined at i.kyivstar.net.
Question and response
Question
dig sweeper.i.kyivstar.net. NS
Answer
The response has no answer records.
Authority
i.kyivstar.net. 86400 SOA pepsi.i.kyivstar.net. hostmaster.kyivstar.net. 2019121101 10800 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0