rtk3.pass.xzvpn.net has no CNAME records.
Question and response
Question
dig rtk3.pass.xzvpn.net. NS
Answer
The response has no answer records.
Authority
xzvpn.net. 3600 SOA ns1.iwantmyname.net. hostmaster.iwantmyname.com. 2022060800 86400 7200 3600000 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0