mxg1.freexion.net has no NS records.
NS records for this zone are defined at freexion.net.
NS records for this zone are defined at freexion.net.
Question and response
Question
dig mxg1.freexion.net. NS
Answer
The response has no answer records.
Authority
freexion.net. 300 SOA x.ns.joker.com. hostmaster.joker.com. 2017111749 14400 3600 604800 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0