gcp.bak.idcfcloud.net has no NS records.
NS records for this zone are defined at bak.idcfcloud.net.
NS records for this zone are defined at bak.idcfcloud.net.
Question and response
Question
dig gcp.bak.idcfcloud.net. NS
Answer
The response has no answer records.
Authority
bak.idcfcloud.net. 3600 SOA ns01.idcfcloud.com. khomma.idcf.jp. 2 10800 3600 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0