cnames.cerb.cloud has no NS records.
NS records for this zone are defined at cerb.cloud.
NS records for this zone are defined at cerb.cloud.
Question and response
Question
dig cnames.cerb.cloud. NS
Answer
The response has no answer records.
Authority
cerb.cloud. 900 SOA ns-813.awsdns-37.net. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0