xtambo-mta.rcp.pe has no CNAME records.
Question and response
Question
dig xtambo-mta.rcp.pe. NS
Answer
The response has no answer records.
Authority
rcp.pe. 3600 SOA NS.RCP.NET.pe. operador.rcp.pe. 2025110400 3600 1800 604800 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0