136-55-228-91.googlefiber.net has no NS records.
NS records for this zone are defined at googlefiber.net.
NS records for this zone are defined at googlefiber.net.
Question and response
Question
dig 136-55-228-91.googlefiber.net. NS
Answer
The response has no answer records.
Authority
googlefiber.net. 300 SOA ns-cloud-a1.googledomains.com. cloud-dns-hostmaster.google.com. 1 21600 3600 259200 300
Additional
. 0 OPT ; payload 512, xrcode 0, version 0, flags 0