mail2.digitalinsight.com has no NS records.
NS records for this zone are defined at digitalinsight.com.
NS records for this zone are defined at digitalinsight.com.
Question and response
Question
dig mail2.digitalinsight.com. NS
Answer
The response has no answer records.
Authority
digitalinsight.com. 86400 SOA edns123.ultradns.com. servicesmanagement\.di.ncr.com. 2017032979 28800 7200 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0