ns1.hover.com has no CNAME records.
Question and response
Question
dig ns1.hover.com. NS
Answer
The response has no answer records.
Authority
hover.com. 34 SOA ns1.tucows.com. hostmaster.hover.com. 1771953708 10800 3600 2592000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0