g.cogeco.com has no CNAME records.
Question and response
Question
dig g.cogeco.com. NS
Answer
The response has no answer records.
Authority
cogeco.com. 10800 SOA ns1.cgocable.net. hostmaster.cgocable.ca. 2003093162 10800 3600 604800 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0