backup.genmills.com has no NS records.
NS records for this zone are defined at genmills.com.
NS records for this zone are defined at genmills.com.
Question and response
Question
dig backup.genmills.com. NS
Answer
The response has no answer records.
Authority
genmills.com. 900 SOA mgoextdns1.genmills.com. dom\.admin.genmills.com. 1103 10800 3600 2419200 900
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0