23-31-215-228-static.hfc.comcastbusiness.net has no CNAME records.
Question and response
Question
dig 23-31-215-228-static.hfc.comcastbusiness.net. NS
Answer
The response has no answer records.
Authority
hfc.comcastbusiness.net. 862 SOA ns.hfc.comcastbusiness.net. dnsmaster.comcastonline.com. 2022956822 7200 300 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0