What to run
Use DNS Lookup. DNS Lookup is DNS-over-HTTPS from the browser and does not follow CNAMEs.
How to read the result
Status NOERROR with answers means the name has A data.
NXDOMAIN means the name does not exist.
NOERROR with zero answers means the name exists but has no A record.
TTL is seconds this answer may be cached.
What to open next
Use DNS Lookup for AAAA for IPv6, and for CNAME if the A list is empty and you expected a host.
If NXDOMAIN surprises you, open Whois Lookup. Whois is RDAP: registrar, statuses, dates, and nameservers.