mta6547.mxmfb.com has no NS records.
NS records for this zone are defined at mxmfb.com.
NS records for this zone are defined at mxmfb.com.
Question and response
Question
dig mta6547.mxmfb.com. NS
Answer
The response has no answer records.
Authority
mxmfb.com. 900 SOA ns-2035.awsdns-62.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0