ns7.googledomains.com has no NS records.
NS records for this zone are defined at googledomains.com.
NS records for this zone are defined at googledomains.com.
Question and response
Question
dig ns7.googledomains.com. NS
Answer
The response has no answer records.
Authority
googledomains.com. 60 SOA ns5.googledomains.com. dns-admin.google.com. 883061705 900 900 1800 60
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0