mx1.falconide.com has no NS records.
NS records for this zone are defined at falconide.com.
NS records for this zone are defined at falconide.com.
Question and response
Question
dig mx1.falconide.com. NS
Answer
The response has no answer records.
Authority
falconide.com. 180 SOA ns11.constellix.com. dns.constellix.com. 2015010502 43200 3600 1209600 180
Additional
. 0 OPT ; payload 1280, xrcode 0, version 0, flags 0