Apex domains cannot have CNAME records.
Question and response
Question
dig bluetie.com. NS
Answer
bluetie.com. 5 NS edns2.ultradns.com.
bluetie.com. 5 NS edns2.ultradns.org.
bluetie.com. 5 NS edns2.ultradns.biz.
bluetie.com. 5 NS edns2.ultradns.net.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0