ns187.hostgator.com has no CNAME records.
Question and response
Question
dig ns187.hostgator.com. NS
Answer
The response has no answer records.
Authority
hostgator.com. 1229 SOA cody.ns.cloudflare.com. dns.cloudflare.com. 2397870024 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0