hd8fh0.ruh1.oracleemaildelivery.com has no NS records.
NS records for this zone are defined at ruh1.oracleemaildelivery.com.
NS records for this zone are defined at ruh1.oracleemaildelivery.com.
Question and response
Question
dig hd8fh0.ruh1.oracleemaildelivery.com. NS
Answer
The response has no answer records.
Authority
ruh1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.ruh1.oracleemaildelivery.com. 221594 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0