submit.esvalabs.com has no NS records.
NS records for this zone are defined at esvalabs.com.
NS records for this zone are defined at esvalabs.com.
Question and response
Question
dig submit.esvalabs.com. NS
Answer
The response has no answer records.
Authority
esvalabs.com. 900 SOA ns-187.awsdns-23.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0