Apex domains cannot have CNAME records.
Question and response
Question
dig oraclersys.net. NS
Answer
oraclersys.net. 5 NS a10-65.akam.net.
oraclersys.net. 5 NS a13-66.akam.net.
oraclersys.net. 5 NS a1-16.akam.net.
oraclersys.net. 5 NS a28-66.akam.net.
oraclersys.net. 5 NS a18-67.akam.net.
oraclersys.net. 5 NS a7-66.akam.net.
Authority
The response has no authority records.
Additional
a18-67.akam.net. 1 A 95.101.36.67
a18-67.akam.net. 1 AAAA 2600:1480:4800:0:0:0:0:43
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0