mail03.visitcloud.com has no NS records.
NS records for this zone are defined at visitcloud.com.
NS records for this zone are defined at visitcloud.com.
Question and response
Question
dig mail03.visitcloud.com. NS
Answer
The response has no answer records.
Authority
visitcloud.com. 900 SOA ns-1114.awsdns-11.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0