Free · No signup · 19 checks in one scan

Domain Health Checker

One scan, your whole domain. Domain Doctor checks DNS, email authentication, SSL, security headers, blacklists, hosting and speed, then scores your domain and shows you exactly what to fix.

19 checks per scan Results in seconds Free, no signup

DNSA, AAAA, MX, NS, DNSSEC

Email authSPF, DKIM, DMARC, MTA-STS

SSL / TLSCertificate, chain, protocols

SecurityHeaders, open ports

ReputationBlacklists, deliverability

SpeedResponse time, compression

Everything in one scan

All 19 checks, one page

Domain Doctor runs every check below and scores your domain from A+ to F. Each links to a focused tool with a full explanation and fixes.

DMARCConfirms your record exists, is valid, and enforces.SPFValidates one record within the 10-lookup limit, ending in -all.DKIMFinds your DKIM keys across selectors and checks key strength.MX recordsLists your mail servers and confirms every one resolves.MTA-STSChecks the DNS record and policy for enforced TLS delivery.TLS-RPTVerifies TLS reporting so you hear about delivery failures.DeliverabilityCombines auth, reverse DNS and blacklists into one score.SSL / TLSReads your certificate, expiry, hostname match and protocols.Security headersGrades HSTS, CSP, nosniff and clickjacking protection.BlacklistsChecks your sending IP and domain against major DNSBLs.Open portsScans common ports and flags risky exposed services.RedirectsTraces your redirect chain and canonical host handling.Website speedMeasures server response time, size and compression.DNS recordsConfirms your A and AAAA records resolve to public IPs.NameserversChecks for redundant nameservers and DNSSEC.IP & hostingIdentifies your host, ASN, location and reverse DNS.CloudflareDetects whether traffic is proxied or DNS-only.WordPressDetects WordPress and flags an exposed version.Website statusConfirms the site loads and returns a healthy status.

“68.8% of domains have no effective DMARC protection.”

What we catch

The issues most domains have

These are the problems Domain Doctor finds most often. Any one of them can hurt deliverability, security or trust.

No DMARC record: anyone can spoof email from your domain
SPF ends in +all or exceeds the 10-DNS-lookup limit
SSL certificate expiring within 30 days
Missing HSTS or Content-Security-Policy headers
Sending IP listed on a spam blacklist

VASTROX Hosting, Email and DNS

Let VASTROX fix everything it finds

One team for your hosting, email authentication, DNS and SSL, set up correctly and monitored so your domain scores an A and stays there.

Hosting, email, DNS and SSL in one place
Every issue above fixed for you
Free migration and expert support

Get VASTROX to fix it See VASTROX VPS

Hosting, VPS, business email and game servers. Free migration. Real support.

“One misconfiguration can quietly cost you customers.”

Questions

Frequently asked

Is the domain health checker free?

Yes. Every scan is free, needs no signup, and returns results in seconds. You can check as many domains as you like.

What does the score mean?

We combine 19 checks into a 0 to 100 score and an A+ to F grade. Email authentication, SSL and reachability carry the most weight because they have the biggest impact on security and deliverability.

Do you store my results?

We briefly cache a report so a repeat scan of the same domain is instant, then it expires. We do not require an account or keep a history tied to you.

Can VASTROX fix the issues it finds?

Yes. VASTROX provides hosting, email, DNS and SSL services and can configure SPF, DKIM, DMARC, MTA-STS, certificates and security headers for you.

Fix it, or host it right from the start

Domain Doctor is free to use. When you want to fix what it finds, or move to a host that gets it right by default, VASTROX has you covered.

Web Hosting →Fast NVMe hosting with free SSL, caching and a CDN.WordPress Hosting →Managed, hardened, always-updated WordPress.VPS & Cloud Servers →Scalable Linux and Windows VPS on fast infrastructure.Email, DNS & SSL →Have our team configure your email, DNS and SSL.