Live
DNS Lookup
Check A, AAAA, CNAME, MX, NS, TXT, SOA and CAA records for any domain.
Open tool →Domain diagnostics & troubleshootingCheck your domain.
Check your domain.
Find the problem.
Fix it faster.
Diagnose DNS, SSL, email authentication, domain and website connection issues with free tools and clear troubleshooting guidance.
✓ No signup✓ Free diagnostics✓ Plain-English results
domainexample.com
✓DNS records detected
✓SSL certificate trusted
✓HTTPS responding
emailSPF · DKIM · DMARC
nextreview issues & guidance
Domain toolbox
Diagnose the problem with the right tool.
Check DNS, email authentication, SSL, domain records, propagation, HTTP responses and overall domain health.
Live
DNS Propagation Checker
Check DNS propagation from live probes in multiple countries and view results on a world map.
Open tool →Live
SSL Checker
Inspect a website certificate, expiry date, issuer and common SSL problems.
Open tool →Live
MX Lookup
Find the mail servers responsible for receiving email for a domain.
Open tool →Live
Email Security Checker
Check SPF, DMARC, DKIM and MX settings used to authenticate domain email.
Open tool →Live
Domain Health Checker
Run DNS, email, SSL and HTTPS health checks from one dashboard.
Open tool →Live
HTTP Status Checker
Check response codes, redirects, final URLs and response times.
Open tool →Live
Domain Lookup
Inspect public registration data, registrar, status and important domain dates using RDAP.
Open tool →Live
What's My IP?
See the public IP address your browser is using to reach this site.
Open tool →One domain. Multiple checks.
Start with a complete domain health check.
Not sure which tool you need? ZoneCheckr can inspect the major technical components behind your domain in one place.
✓ DNS records✓ Nameservers & SOA✓ MX & email configuration✓ SPF & DMARC✓ SSL/TLS✓ HTTPS response
Run Domain Health CheckDOMAIN HEALTHexample.com
Scan completeDNSPASS
NameserversPASS
SSL / TLSPASS
SPFPASS
DMARCWARNING
DKIMINFO
Troubleshooting guides
Understand what went wrong — and how to fix it.
Practical guides for DNS, domain, email, SSL and website connection problems.
How Long Does DNS Propagation Take?
Understand why DNS changes take time, how propagation works, and how to check whether your new records are live.
Read guide →DNS_PROBE_FINISHED_NXDOMAIN: How to Fix It
Learn what NXDOMAIN means and troubleshoot nameservers, DNS records, caching, and propagation issues.
Read guide →SPF vs DKIM vs DMARC
Understand the three core email-authentication technologies and how they help protect your domain.
Read guide →9diagnostic tools
0accounts required
1domain to start diagnosing
Technical domain support
Found the problem but need help fixing it?
ZoneCheckr can help with domain and registrar configuration, DNS, SSL, email authentication, hosting connections, Cloudflare, subdomains, redirects and domain migrations.