ns0.attdns.net has no CNAME records.
Question and response
Question
dig ns0.attdns.net. NS
Answer
The response has no answer records.
Authority
attdns.net. 300 SOA ns0.attdns.net. eiss-dns.att.com. 2025082101 3600 1800 2592000 300
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0