aca186ab0.ord1.oracleemaildelivery.com has no NS records.
NS records for this zone are defined at ord1.oracleemaildelivery.com.
NS records for this zone are defined at ord1.oracleemaildelivery.com.
Question and response
Question
dig aca186ab0.ord1.oracleemaildelivery.com. NS
Answer
The response has no answer records.
Authority
ord1.oracleemaildelivery.com. 300 SOA ns1.p68.dns.oraclecloud.net. hostmaster.ord1.oracleemaildelivery.com. 607930 3600 600 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0