mx1.bora.net has no NS records.
NS records for this zone are defined at bora.net.
NS records for this zone are defined at bora.net.
Question and response
Question
dig mx1.bora.net. NS
Answer
The response has no answer records.
Authority
bora.net. 600 SOA nis.dacom.co.kr. dnsmaster.bora.net. 2026020600 21600 900 604800 600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0