mx3.navigacloud.com has no NS records.
NS records for this zone are defined at navigacloud.com.
NS records for this zone are defined at navigacloud.com.
Question and response
Question
dig mx3.navigacloud.com. NS
Answer
The response has no answer records.
Authority
navigacloud.com. 900 SOA ns-1260.awsdns-29.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0