smtpb14.lacoocan.nifty.com has no NS records.
NS records for this zone are defined at lacoocan.nifty.com.
NS records for this zone are defined at lacoocan.nifty.com.
Question and response
Question
dig smtpb14.lacoocan.nifty.com. NS
Answer
The response has no answer records.
Authority
lacoocan.nifty.com. 900 SOA ns-1821.awsdns-35.co.uk. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0