backup.wahju.com has no NS records.
NS records for this zone are defined at wahju.com.
NS records for this zone are defined at wahju.com.
Question and response
Question
dig backup.wahju.com. NS
Answer
The response has no answer records.
Authority
wahju.com. 14400 SOA ns100.wahju.com. hostmaster.wahju.com. 2020051914 14400 3600 1209600 86400
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0