mx.hattara.io has no NS records.
NS records for this zone are defined at hattara.io.
NS records for this zone are defined at hattara.io.
Question and response
Question
dig mx.hattara.io. NS
Answer
The response has no answer records.
Authority
hattara.io. 1800 SOA lars.ns.cloudflare.com. dns.cloudflare.com. 2398489829 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0