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CAA Record Lookup

A CAA, or Certification Authority Authorization, record lists which certificate authorities are allowed to issue SSL or TLS certificates for your domain. Public CAs are required by industry rules to check this record before issuing. Without it, any CA can issue a cert for your do

Domain Tools

A CAA, or Certification Authority Authorization, record lists which certificate authorities are allowed to issue SSL or TLS certificates for your domain. Public CAs are required by industry rules to check this record before issuing. Without it, any CA can issue a cert for your do

This free CAA Record Lookup from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.

How to use the CAA Record Lookup

  1. Enter the domain or IP address.
  2. Pick the record type if the tool supports filtering.
  3. Run the lookup - most checks return in under a second.
  4. Copy the records for your DNS migration or audit notes.

What you can do with the CAA Record Lookup

  • Audit DNS before a domain migration.
  • Verify SSL certificate expiry and chain.
  • Check domain age and history before buying.
  • Diagnose email-delivery issues (SPF, DKIM, DMARC).

Why use KX Toolkit's CAA Record Lookup

  • Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
  • Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
  • Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
  • Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
  • One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.

Tips for the best results

DNS changes propagate at different speeds across resolvers - run the same check from Google (8.8.8.8) and Cloudflare (1.1.1.1) before declaring a problem.

Related Domain Tools

If you find this tool useful, explore the full Domain Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.

What is a CAA record and why should I publish one?
A CAA, or Certification Authority Authorization, record lists which certificate authorities are allowed to issue SSL or TLS certificates for your domain. Public CAs are required by industry rules to check this record before issuing. Without it, any CA can issue a cert for your domain, which is a known vector for misissuance attacks. Publishing CAA is a simple, high-value security improvement that takes minutes to configure.
What does a typical CAA record look like?
A CAA record has a flag, a tag, and a value. The most common form is 0 issue "letsencrypt.org", which authorizes Let's Encrypt to issue certificates. You can add multiple records for multiple CAs, use issuewild for wildcard certs specifically, and add an iodef tag pointing to a mailto address that should receive violation reports. The lookup shows all CAA records for the queried domain and any parent domains that apply.
Does the absence of CAA records mean my domain is unsafe?
Not unsafe, but less protected. With no CAA published, every public CA is allowed to issue certificates for your domain, which means a single compromised registrar account or social-engineered support agent at any CA could mint a valid cert. Publishing CAA does not replace good account security, but it dramatically narrows the attack surface and is recommended for every production domain.
How do CAA records interact with subdomains?
CAA is checked starting at the requested name and walking up the DNS tree. If example.com has a CAA record but blog.example.com does not, the CA uses the parent's record. To override at a subdomain, simply publish a different CAA there. This makes it easy to apply a strict policy at the apex and loosen it for specific environments such as staging or vendor-managed subdomains.
What is the iodef tag in a CAA record?
The iodef tag tells CAs where to report attempts at unauthorized certificate issuance. A common value is 0 iodef "mailto:security@example.com". When a CA receives a request that would violate your CAA policy, it can email this address with details of the request. This gives security teams early warning of attempted misissuance and is highly recommended for organizations with mature monitoring.
Will adding a CAA record break my existing certificates?
Adding CAA never affects already issued certificates; it only governs future issuance and renewals. The risk is forgetting to authorize the CA you actually use, which would block your next renewal. Before publishing, list every CA your team uses across all teams and properties, including managed services and CDN-issued certs, and add an entry for each. Test with a renewal before relying on the policy in production.

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