ritternet-com.mx.av-mx.com has no CNAME records.
Question and response
Question
dig ritternet-com.mx.av-mx.com. NS
Answer
The response has no answer records.
Authority
av-mx.com. 359 SOA ns1.neonova.net. hostmaster.neonova.net. 2026020200 10800 3600 604800 900
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0