start.tuthost.com has no NS records.
NS records for this zone are defined at tuthost.com.
NS records for this zone are defined at tuthost.com.
Question and response
Question
dig ghs.google.com. NS
Answer
The response has no answer records.
Authority
google.com. 60 SOA ns1.google.com. dns-admin.google.com. 873978624 900 900 1800 60
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0