mx.21gambling.com has no NS records.
NS records for this zone are defined at 21gambling.com.
NS records for this zone are defined at 21gambling.com.
Question and response
Question
dig mx.21gambling.com. NS
Answer
The response has no answer records.
Authority
21gambling.com. 3600 SOA dns.21gambling.com. hostmaster.21gambling.com. 1790883370 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0