Apex domains cannot have CNAME records.
Question and response
Question
dig pacificinternet.com. NS
Answer
pacificinternet.com. 5 NS dns2.pacificinternet.com.
pacificinternet.com. 5 NS dns2.pacific.net.sg.
pacificinternet.com. 5 NS dns3.pacificinternet.com.
pacificinternet.com. 5 NS dns1.pacificinternet.com.
pacificinternet.com. 5 NS dns1.pacific.net.sg.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0