mail999.onsecureax.com has no NS records.
NS records for this zone are defined at onsecureax.com.
NS records for this zone are defined at onsecureax.com.
Question and response
Question
dig mail999.onsecureax.com. NS
Answer
The response has no answer records.
Authority
onsecureax.com. 900 SOA ns-1463.awsdns-54.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0