DNS lookup

Questions

Where do the answers come from?

From Cloudflare public DNS (1.1.1.1), so you see what the internet sees right now, not your local cache.

Can I do a reverse lookup?

Yes. Type an IPv4 address and you get its PTR record (the host name).

What is TTL?

Time to live: how many seconds resolvers may cache the record before asking again.

Is there an API?

Yes: wezzet.com/api/dns?name=example.com&type=MX returns plain text, or JSON with &fmt=json.