ns4.p201.dns.oraclecloud.net has no CNAME records.
Question and response
Question
dig ns4.p201.dns.oraclecloud.net. NS
Answer
The response has no answer records.
Authority
oraclecloud.net. 1559 SOA ns0.dynamicnetworkservices.net. hostmaster.oracle.com. 2025111101 7200 900 605000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0