smtp5.email.eu-madrid-2.ocs.oraclecloud.eu has no NS records.
NS records for this zone are defined at eu-madrid-2.ocs.oraclecloud.eu.
NS records for this zone are defined at eu-madrid-2.ocs.oraclecloud.eu.
Question and response
Question
dig smtp5.email.eu-madrid-2.ocs.oraclecloud.eu. NS
Answer
The response has no answer records.
Authority
eu-madrid-2.ocs.oraclecloud.eu. 300 SOA ns1.p200.dns.eu-madrid-2.oci.oraclerealm.eu. hostmaster.eu-madrid-2.ocs.oraclecloud.eu. 2016 3600 900 31536000 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0