mx.ntnu.no has no NS records.
NS records for this zone are defined at ntnu.no.
NS records for this zone are defined at ntnu.no.
Question and response
Question
dig mx.ntnu.no. NS
Answer
The response has no answer records.
Authority
ntnu.no. 3600 SOA dnsadmin.itea.ntnu.no. hostmaster.ntnu.no. 2026021200 28800 3600 2419200 3600
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0