vivaldi.telepac.pt has no CNAME records.
Question and response
Question
dig vivaldi.telepac.pt. NS
Answer
The response has no answer records.
Authority
telepac.pt. 785 SOA dnsbho1aut01.local. dnsadmin.mail.telepac.pt. 2023581765 600 7200 604800 1800
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0