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LookupOwl

All tools

Every tool we have, in one place. Each one is also an API endpoint and an MCP tool. Free, with no signup.

Domain tools

Who registered a domain, when it expires, who hosts it and how well it is set up. We read the registry directly, explain it in plain English, and never ask you to sign up.

DNS tools

Ask DNS directly, and see whether your change has reached resolvers around the world. Every answer shows its TTL, so you know how long it will last.

  • DNS lookup

    A, AAAA, MX, TXT, CAA and more, straight from a resolver.

  • DNS propagation

    Has your change reached resolvers around the world yet?

  • Reverse DNS

    Find the hostname behind an IP address.

Email tools

Check and build the records that keep your mail delivered and your name safe from spoofing, and see whether a blocklist is turning your mail away. We warn you about mistakes before they cost you deliverability.

  • SPF checker

    Validate your SPF record and count lookups against the limit of 10.

  • DMARC checker

    Read your DMARC policy and what it asks receivers to do.

  • SPF generator

    Build a correct SPF record from the services you send with.

  • DMARC generator

    Roll out DMARC safely, from monitoring to reject.

  • DKIM checker

    Find a domain's DKIM keys, even without the selector.

  • Blacklist checker

    Is an IP, mail server or domain on a spam blocklist?

IP and network tools

Find out where an address is, who runs it and which network it belongs to, who made a network card, and how to slice a block of addresses. None of it needs an account or key.

Web tools

See exactly what a web server sends back, one hop at a time: status codes, headers, protocol and every redirect on the way. Handy for caching, security headers and migrations.

Security tools

Check that a site's certificate is valid before visitors notice it isn't, see which security headers it sends, and make strong passwords that are created in your browser and never sent to us.