www.tower.ca has no CNAME records.
Question and response
Question
dig www.tower.ca. NS
Answer
The response has no answer records.
Authority
tower.ca. 300 SOA ns1.linuxmagic.com. hostmaster.wizard.ca. 2005041216 86400 3600 3600000 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0