itb-blocked.cox.com has no CNAME records.
Question and response
Question
dig itb-blocked.cox.com. NS
Answer
The response has no answer records.
Authority
cox.com. 2340 SOA dukensumpov1z.services.cox.net. hostmaster.cox.net. 781212138 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0