int.smtp-eu20.advancedhosters.com has no NS records.
NS records for this zone are defined at smtp-eu20.advancedhosters.com.
NS records for this zone are defined at smtp-eu20.advancedhosters.com.
Question and response
Question
dig int.smtp-eu20.advancedhosters.com. NS
Answer
The response has no answer records.
Authority
smtp-eu20.advancedhosters.com. 1200 SOA ns2.advancedhosters.com. admin.smtp-eu20.advancedhosters.com. 1588599940 21600 3600 691200 38400
Additional
The response has no additional records.