webmail.sco.ru has no NS records.
NS records for this zone are defined at sco.ru.
NS records for this zone are defined at sco.ru.
Question and response
Question
dig webmail.sco.ru. NS
Answer
The response has no answer records.
Authority
sco.ru. 7200 SOA ns.sco.ru. admin.sco.ru. 2025092922 14400 600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0