mx106.calserver.eu has no NS records.
NS records for this zone are defined at calserver.eu.
NS records for this zone are defined at calserver.eu.
Question and response
Question
dig mx106.calserver.eu. NS
Answer
The response has no answer records.
Authority
calserver.eu. 3600 SOA ns1.cal.pl. hostmaster.calserver.eu. 2026022200 3600 3600 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0