ds.am4.ams.GBlNET.net has no CNAME records.
Question and response
Question
dig ds.am4.ams.GBlNET.net. NS
Answer
The response has no answer records.
Authority
ams.GBlNET.net. 2235 SOA ns.GBlNET.net. vvv.GBlNET.net. 2025092601 60 1200 1209600 259200
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0