ns4bht.name.com has no CNAME records.
Question and response
Question
dig ns4bht.name.com. NS
Answer
The response has no answer records.
Authority
name.com. 1132 SOA margaret.ns.cloudflare.com. dns.cloudflare.com. 2397154212 10000 2400 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0