mx.triple9music.com has no NS records.
NS records for this zone are defined at triple9music.com.
NS records for this zone are defined at triple9music.com.
Question and response
Question
dig mx.triple9music.com. NS
Answer
The response has no answer records.
Authority
triple9music.com. 3600 SOA dns.triple9music.com. hostmaster.triple9music.com. 1977978253 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0