ns1.ipowerdns.com has no CNAME records.
Question and response
Question
dig ns1.ipowerdns.com. NS
Answer
The response has no answer records.
Authority
ipowerdns.com. 135 SOA ns1.ipowerweb.net. hostmaster.ipowerweb.net. 2002101100 80000 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0