Network & IP Runs in browser Updated 30 Mar 2026

MX Lookup

Look up MX records for any domain — mail server priority, IP addresses, and email provider detection.

Domain name

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How to use MX Lookup

Enter a domain

Type the domain you want to check — for example, example.com.
Run the lookup

Click the Lookup button or press Enter to query MX records via Cloudflare DNS-over-HTTPS.
Review mail servers

See each MX record sorted by priority (lowest is preferred), along with its resolved IP address and auto-detected email provider.

MX Lookup FAQ

What is an MX record?

An MX (Mail Exchange) record specifies which mail servers accept incoming email for a domain and in what order of preference. Lower priority values indicate higher preference — a server with priority 10 is preferred over one with priority 20.

How does email provider detection work?

The tool matches each MX hostname against known patterns for major email providers. Servers ending in .google.com or aspmx.l.google.com indicate Google Workspace. Servers ending in mail.protection.outlook.com indicate Microsoft 365.

Why might no MX records be found?

The domain may not be configured to receive email, may rely on a legacy A-record fallback, or may be an invalid or unregistered domain.

Is this lookup private?

The only external requests are DNS-over-HTTPS queries to Cloudflare and follow-up A-record lookups for IP resolution. No data is stored or shared by this tool.

What does MX priority mean for email deliverability?

When sending email, the sending server tries the lowest priority MX first. If that server is unreachable, it tries the next highest priority server. Having multiple MX records provides redundancy.

How accurate are the IP addresses shown?

IPs are resolved in real time from A record lookups. Mail servers may have multiple IPs and the resolved address reflects what Cloudflare's resolver returns at query time.

Can I verify email deliverability with this tool?

MX lookup confirms the routing is configured. For full deliverability validation — including SPF, DKIM, and DMARC — use the SPF Checker and DNS Lookup tools alongside this one.

What if I see multiple MX records?

Multiple MX records provide failover and load distribution. The primary server handles most mail; the others act as backups if the primary is unavailable.

Background

Discover which mail servers handle email for any domain. This tool queries MX records via Cloudflare's DNS-over-HTTPS API, sorts them by priority (lowest number = highest preference), resolves the IP address of each mail server, and automatically identifies the email provider from well-known hostname patterns — Google Workspace, Microsoft 365, Zoho Mail, Fastmail, and others.

Use it to verify email routing, debug delivery failures, check which email provider a domain uses, or investigate potential spam infrastructure. All lookups run directly in your browser.

Who is this for: email administrators troubleshooting delivery, sales teams identifying a prospect's email platform, developers building email tools, and security researchers auditing domain email configurations.

DNS Lookup

Query all DNS record types for any domain — A, AAAA, MX, TXT, CNAME, NS, SOA, CAA — via Cloudflare DoH.

SPF Record Checker

Look up and validate SPF records — parse mechanisms, detect misconfigurations, and check email authentication.

WHOIS Lookup

Look up domain registration details — registrar, creation/expiry dates, nameservers, and DNSSEC — via RDAP.

SSL Certificate Checker

Check SSL/TLS certificate validity, issuer, expiry, and SANs for any domain via Certificate Transparency logs.

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