mlgw0001n.ecl.ntt.com has no NS records.
NS records for this zone are defined at ecl.ntt.com.
NS records for this zone are defined at ecl.ntt.com.
Question and response
Question
dig mlgw0001n.ecl.ntt.com. NS
Answer
The response has no answer records.
Authority
ecl.ntt.com. 60 SOA a1-20.akam.net. root.cloudn2.net. 2018024082 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0