mail.sci.uz has no NS records.
NS records for this zone are defined at sci.uz.
NS records for this zone are defined at sci.uz.
Question and response
Question
dig mail.sci.uz. NS
Answer
The response has no answer records.
Authority
sci.uz. 10800 SOA ns08.uzsci.net. webmaster.uzsci.net. 1541673656 10800 3600 604800 10800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0