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MX Record Lookup

An MX, or Mail Exchanger, record tells the internet which servers are responsible for accepting email for a domain. When someone sends a message to you@example.com, their mail server queries DNS for the MX records of example.com and delivers to the host with the lowest priority v

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Enter a bare domain or full URL - we'll extract the hostname.

An MX, or Mail Exchanger, record tells the internet which servers are responsible for accepting email for a domain. When someone sends a message to you@example.com, their mail server queries DNS for the MX records of example.com and delivers to the host with the lowest priority v

This free MX 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 MX 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 MX 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 MX 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 an MX record and why does it matter?
An MX, or Mail Exchanger, record tells the internet which servers are responsible for accepting email for a domain. When someone sends a message to you@example.com, their mail server queries DNS for the MX records of example.com and delivers to the host with the lowest priority value. Without correctly configured MX records, your domain simply cannot receive email, no matter how well your website or other services are running.
What does the priority number mean in MX records?
Each MX record carries a priority value, sometimes called preference. Lower numbers mean higher priority, so a record with priority 10 is tried before one with priority 20. This lets you list a primary mail server and one or more backups. If two records share the same priority, mail servers load-balance between them. The tool displays priorities exactly as published so you can verify failover order.
How can I tell which email provider a domain uses?
The hostnames in the MX records reveal the provider. Targets ending in google.com or googlemail.com indicate Google Workspace, outlook.com points to Microsoft 365, mailgun.org or mx.zoho.com show those services, and so on. Self-hosted setups usually display a hostname inside the same domain, like mail.example.com. This lookup is a fast way to research competitors, validate vendor claims, or confirm a migration is complete.
Why do my MX records look correct but mail still bounces?
MX records only point to the receiving servers; delivery still depends on SPF, DKIM, DMARC, valid TLS certificates, and the receiving mailbox actually existing. A common pitfall is having MX records that point to a CNAME, which the DNS standard forbids. Another is publishing MX records without removing old ones from a previous provider. Use the MX lookup alongside the SPF and DMARC checkers to diagnose the full delivery chain.
How long do MX record changes take to propagate?
Propagation depends on the TTL, or time to live, set on the records. A typical TTL of 3600 seconds means resolvers around the world refresh within an hour, but some ISPs ignore TTL and cache for longer. For migrations, lower the TTL to 300 seconds a day before the switch, then raise it again after the change settles. The DNS Propagation Checker is useful for confirming the new records are live globally.
Can a domain have no MX records at all?
Yes, and it is sometimes intentional. A domain that should never receive mail can publish a Null MX record, which is a single MX with priority 0 and target ".". This signals to senders that the domain explicitly refuses email. If a domain has no MX records and no Null MX, senders may fall back to the A record, which is rarely what you want. Always publish MX records explicitly.

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