Free domain diagnostics — live, not cached
Know your domain’s health
before your customers do.
SPF, DKIM, DMARC, DNS, SSL, blacklists and uptime — diagnosed in plain English, in seconds. The same silent failures that kill email delivery and take sites offline, found while they are still cheap to fix.
No signup. Every check runs against live DNS, exactly as a mail server sees it.
Your IP address: 216.73.216.4 · seen exactly as the DNS world sees you
A real report, generated by the tool above. Yours takes about ten seconds.
The diagnostic toolkit
One purpose: nothing about your domain fails silently.
SPF Checker
Validate an SPF record, count its DNS lookups and catch the mistakes that break email delivery.
→ 02DMARC Checker
Check a domain's DMARC policy and grade how protected it really is against spoofing.
→ 03DMARC Generator
Build a correct DMARC record in seconds — start at monitoring, end at reject.
→ 04DKIM Checker
Look up a DKIM selector, verify the public key and estimate its strength.
→ 05DNS Checker
A complete snapshot of a domain's DNS records: A, AAAA, MX, NS, TXT, SOA and CAA.
→ 06Blacklist Checker
Check an IP address or domain against the major DNS blacklists in one go.
→ 07SSL Checker
Check a certificate's expiry, issuer and coverage before it takes your site down.
→ 08Website Uptime Checker
Is it down for everyone or just you? Check any website's status and response time.
→ 09WHOIS Lookup
Find any domain's registrar, creation date, expiry date and status — and how long is left before it lapses.
→Why MXDoctor exists
Domains rarely crash. They quietly rot.
Expiry dates nobody tracked
An SSL certificate lapses on a Sunday, a domain renewal card declines — and everything stops at once. The failure was scheduled months in advance; it just was not on anyone’s calendar.
Email records that drift
A marketing tool gets connected, a server migrates, an SPF include chain grows past the 10-lookup limit. Nothing looks broken — until invoices land in spam.
Diagnosis beats downtime
Every MXDoctor check runs live, explains itself in plain English and shows the exact record involved. Run one when something feels off — or let UptimeVitals run them all, around the clock.
UptimeVitals watches SPF, DKIM, DMARC, DNS, SSL and uptime around the clock and alerts you before your customers notice. From $5/mo.