ns1.onfiber.com.mx has no CNAME records.
Question and response
Question
dig ns1.onfiber.com.mx. NS
Answer
The response has no answer records.
Authority
onfiber.com.mx. 3044 SOA ns1.lapsoluciones.com. root.vpsmx.lapsoluciones.com. 2026021001 3600 1800 1209600 86400
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0