mx.cifidww.com has no NS records.
NS records for this zone are defined at cifidww.com.
NS records for this zone are defined at cifidww.com.
Question and response
Question
dig mx.cifidww.com. NS
Answer
The response has no answer records.
Authority
cifidww.com. 3600 SOA dns.cifidww.com. hostmaster.cifidww.com. 1772623742 43200 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0