support.cox.net has no CNAME records.
Question and response
Question
dig support.cox.net. NS
Answer
The response has no answer records.
Authority
cox.net. 2270 SOA dukensumpov1z.services.cox.net. hostmaster.cox.net. 781212129 28800 7200 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0