mx2.email.ncloud.com has no NS records.
NS records for this zone are defined at ncloud.com.
NS records for this zone are defined at ncloud.com.
Question and response
Question
dig mx2.email.ncloud.com. NS
Answer
The response has no answer records.
Authority
ncloud.com. 300 SOA ns1.naverncp.com. ns2.naverncp.com. 854 21600 1800 1209600 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0