NXDOMAIN Error: The Domain Does Not Exist
NXDOMAIN means the requested domain name is not registered in DNS.
NXDOMAIN (Non-Existent Domain) is an authoritative DNS response indicating that the requested domain doesn't exist in the zone. It's different from SERVFAIL which indicates a technical error. NXDOMAIN can occur for a never-registered domain, an expired domain, an unconfigured subdomain, or simply a typo. Understanding this error is essential for diagnosing DNS resolution problems.
Symptoms of an NXDOMAIN Error
- Browser shows "DNS_PROBE_FINISHED_NXDOMAIN" or "This site can't be reached"
- dig returns "status: NXDOMAIN" in the header section
- Emails to this domain are rejected with "host not found"
- The error is consistent across all resolvers (not a cache issue)
Main Causes
- Unregistered domain: The domain was never registered or was deleted from the registry after expiration and redemption period.
- Non-existent subdomain: The main domain exists but the requested subdomain (api.example.com) has no DNS record.
- Misconfigured NS: The nameservers pointed to in the registrar don't contain the zone for this domain.
- seo.dns_nxdomain.cause_4_title seo.dns_nxdomain.cause_4_desc
Diagnostic Steps
- Verify domain registration with whois: whois example.com to see status and expiration date.
- Test the parent domain if it's a subdomain: dig example.com to confirm the zone exists.
- Check configured NS: dig NS example.com and confirm they respond correctly.
- Review DNS history with tools like SecurityTrails to see recent changes.
Prevention with MoniTao
MoniTao helps you prevent NXDOMAIN errors:
- Alert before domain expiration to renew in time
- Detection if a critical subdomain disappears from the zone
- Verification that your DNS records remain configured
Best Practices
- Enable auto-renewal at your registrar
- Keep owner contact information up to date to receive alerts
- Document all your subdomains and their usage
- Monitor critical domains with MoniTao to detect any disappearance
FAQ - NXDOMAIN Error
Can NXDOMAIN be temporary?
No. NXDOMAIN is an authoritative response. If the domain existed before, it was deleted from the zone or NS changed.
How to recover an expired domain?
Contact your registrar immediately. There's a grace period (30 days) then a redemption period (30 days) with higher price.
Why NXDOMAIN on a subdomain that worked?
Someone probably deleted the DNS record. Check the modification history in your DNS panel.
Is NXDOMAIN dangerous for SEO?
Yes. Google will quickly deindex a domain returning NXDOMAIN. It's an absolute emergency to fix.
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