mx.hostcentric.net has no NS records.
NS records for this zone are defined at hostcentric.net.
NS records for this zone are defined at hostcentric.net.
Question and response
Question
dig mx.hostcentric.net. NS
Answer
The response has no answer records.
Authority
hostcentric.net. 10 SOA ns.web2010.com. root.web2010.com. 2005053101 10800 3600 604800 10
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0