edge-node-1.am5.ams.GBlNET.net has no CNAME records.
Question and response
Question
dig edge-node-1.am5.ams.GBlNET.net. NS
Answer
The response has no answer records.
Authority
ams.gblnet.net. 2732 SOA ns.gblnet.net. vvv.gblnet.net. 2025092601 60 1200 1209600 259200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0