redirector.a1.net has no CNAME records.
Question and response
Question
dig redirector.a1.net. NS
Answer
The response has no answer records.
Authority
a1.net. 1679 SOA dns1.a1.net. domainadmin.a1.net. 2026030500 10800 3600 1814400 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0