dns6.rr.com has no CNAME records.
Question and response
Question
dig dns6.rr.com. NS
Answer
The response has no answer records.
Authority
rr.com. 440 SOA dns1.rr.com. hostmaster.charter.com. 2025060044 43200 3600 2419200 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0