c-68-48-217-152.hsd1.mi.comcast.net has no CNAME records.
Question and response
Question
dig c-68-48-217-152.hsd1.mi.comcast.net. NS
Answer
The response has no answer records.
Authority
hsd1.mi.comcast.net. 549 SOA dns101.comcast.net. dnsadmin.comcast.net. 16328116 7200 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0