mail77.pearsontc.net has no NS records.
NS records for this zone are defined at pearsontc.net.
NS records for this zone are defined at pearsontc.net.
Question and response
Question
dig mail77.pearsontc.net. NS
Answer
The response has no answer records.
Authority
pearsontc.net. 900 SOA dns-amer-2.ptns.pearson.com. gns-dnsoperations.pearson.com. 2010121590 900 900 2592000 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0