Apex domains cannot have CNAME records.
Question and response
Question
dig pbase.net. NS
Answer
pbase.net. 1 NS ns2.pbase.net.
pbase.net. 1 NS ns1.pbase.net.
Authority
The response has no authority records.
Additional
ns1.pbase.net. 1 A 202.153.97.2
ns2.pbase.net. 1 A 202.153.97.130
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0