mail.avtlg.ru has no NS records.
NS records for this zone are defined at avtlg.ru.
NS records for this zone are defined at avtlg.ru.
Question and response
Question
dig mail.avtlg.ru. NS
Answer
The response has no answer records.
Authority
avtlg.ru. 86400 SOA adns1.south.rt.ru. dnsmaster.avtlg.ru. 2022111707 86400 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0