Apex domains cannot have CNAME records.
Question and response
Question
dig bigpipeinc.com. NS
Answer
bigpipeinc.com. 5 NS dns1.bigpipeinc.com.
bigpipeinc.com. 5 NS ns5.no.cg.shawcable.net.
bigpipeinc.com. 5 NS ns6.so.cg.shawcable.net.
bigpipeinc.com. 5 NS ns56.st.vc.shawcable.net.
bigpipeinc.com. 5 NS dns2.bigpipeinc.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0