s20.intodomain.com has no CNAME records.
Question and response
Question
dig s20.intodomain.com. NS
Answer
The response has no answer records.
Authority
intodomain.com. 312 SOA ns10.hostdominicano.com. dominio.grupo.host. 2025051604 7200 7200 172800 38400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0