mx.terrahost.no has no NS records.
NS records for this zone are defined at terrahost.no.
NS records for this zone are defined at terrahost.no.
Question and response
Question
dig mx.terrahost.no. NS
Answer
The response has no answer records.
Authority
terrahost.no. 1800 SOA margo.ns.cloudflare.com. dns.cloudflare.com. 2397753892 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0