mta01.sjc.surveymonkey.com has no NS records.
NS records for this zone are defined at surveymonkey.com.
NS records for this zone are defined at surveymonkey.com.
Question and response
Question
dig mta01.sjc.surveymonkey.com. NS
Answer
The response has no answer records.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0