ns2.rackmy.com has no CNAME records.
Question and response
Question
dig ns2.rackmy.com. NS
Answer
The response has no answer records.
Authority
rackmy.com. 93 SOA ns1.ral.hostedsolutions.com. hostmaster.hostedsolutions.com. 2016022213 900 600 86400 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0