mail2724.mkt3120.com has no NS records.
NS records for this zone are defined at mkt3120.com.
NS records for this zone are defined at mkt3120.com.
Question and response
Question
dig mail2724.mkt3120.com. NS
Answer
The response has no answer records.
Authority
mkt3120.com. 900 SOA ns1.acoustic-adm.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0