Runs in your browser
DNS lookup
Resolve one record type.
What this does
Resolves one DNS record type for a name, straight from your browser to Cloudflare's public resolver (1.1.1.1) over DNS-over-HTTPS. The name you enter goes to Cloudflare to run the lookup — nowhere else.
No records vs. no domain
A domain can exist but have no record of the type you asked for — for example, a domain with no MX records still exists. That is different from the domain not existing at all (NXDOMAIN). This tool tells the two apart instead of showing "not found" for both.
TTL
Each answer's TTL is how many seconds a resolver is allowed to cache it before asking again. A short TTL means changes propagate fast; a long one means they take longer to show up everywhere.