ruweb.deserv.net has no NS records.
NS records for this zone are defined at deserv.net.
NS records for this zone are defined at deserv.net.
Question and response
Question
dig ruweb.deserv.net. NS
Answer
The response has no answer records.
Authority
deserv.net. 3600 SOA dedns.deserv.net. root.deserv.net. 2021042601 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0