Understand any domain.
Registration data, DNS, DNSSEC, SSL certificates, web configuration and email security — checked live, explained in plain language and summarized in a transparent health score.
- Free
- No sign-up
- No lookup history published
- Private and internal targets blocked
- Every result explained
Popular tools
Focused checks for when you need one answer quickly.
Registration
4 tools- RDAP / WHOIS Lookup See a domain's registrar, status codes, key dates and nameservers from the official registry RDAP service.
- Domain Availability Find out whether a domain is registered, likely available or cannot be checked, with the evidence behind the answer.
DNS
6 tools- DNS Lookup Query A, AAAA, MX, TXT, NS, SOA, CAA and other records for any hostname through public DNS resolvers.
- DNSSEC Checker Check whether a domain is DNSSEC-signed, whether its DS and DNSKEY records match and whether it validates.
Why DomainDNSCheck
Most lookup sites dump raw data. We interpret it — carefully, and without overstating what the data can prove.
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Honest results
If a registry doesn’t publish data, we say “unknown”. Availability is never presented as certain unless a registrar confirms it.
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Explained, not dumped
Each finding says what it means, why it matters and what to change — in plain language.
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Private by default
No accounts, no tracking, no permanent history of what you look up.
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Every top-level domain
Works for .com, .org, new gTLDs and country-code domains, including internationalised (IDN) names.
One report, six areas, every point explained
The report checks each area independently, so one slow server never holds up the rest. The score follows published rules and lists every deduction.
- Sections load independently — one slow server never blocks the rest.
- The score follows published, versioned rules, and every deduction is listed.
- Areas that cannot be checked are excluded, never guessed.
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DMARC policy is set to “none”Warning
Next step: Move to quarantine once your reports look clean.
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DNSSEC is not enabled for this domainInfo
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HTTPS is enforced with a permanent redirectPass
Monitoring and security
Monitor your domain
Get notified before problems become outages: DNS, registration, SSL and email security changes, with expiry reminders.
How monitoring worksDomain Security Report
Review DNS, TLS and email protection in one report, with a transparent score and the fixes that matter most.
Check a domain’s securityLearn the fundamentals
Short, accurate guides to the systems behind every domain.
Domain Expiry Explained: Renewal, Grace and Deletion
What actually happens when a domain name reaches its expiry date, from renewal and grace periods to redemption, pending delete and release, and why the exact timings depend on the registry and registrar.
DNS & nameserversHow DNS Works: Resolvers, Caching and Propagation
A clear walkthrough of how a domain name becomes an IP address, the difference between recursive and authoritative servers, how caching and TTL work, and what DNS propagation really means.
Security & emailHow SSL/TLS Certificates Work and Why They Fail
A plain-language explanation of TLS certificates: the handshake, certificate chains and authorities, how hostnames are matched, automated renewal with ACME, and the most common certificate errors and their causes.
Built to be trusted
DomainDNSCheck performs passive, non-intrusive checks and treats every destination with caution.
Read our privacy policy- Lookups are cached briefly and never published as pages
- No advertising, analytics or tracking scripts
- Checks never touch private or internal networks
- Passive only — no vulnerability scanning