revdns0.telus.com has no CNAME records.
Question and response
Question
dig revdns0.telus.com. NS
Answer
The response has no answer records.
Authority
telus.com. 3167 SOA dns40.telus.com. dnsadmin2.telus.com. 2019102512 900 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0