DNS Diagnostics
DNSSEC Checker: Verify DNS Security for Any Domain
DNSSEC (DNS Security Extensions) adds cryptographic signatures to DNS records, protecting against cache poisoning and man-in-the-middle attacks. Our DNSSEC checker validates whether a domain has properly configured DNSSEC and verifies the chain of trust from root to the domain.
Launch in Mission ControlWhat It Measures
This tool checks for the presence and validity of DNSSEC records including DNSKEY, DS (Delegation Signer), RRSIG (Resource Record Signature), and NSEC/NSEC3 records. It verifies the complete chain of trust and reports any configuration errors.
How It Works
- Queries the domain for DNSKEY records at the zone apex
- Checks the parent zone for a DS record matching the domain's DNSKEY
- Verifies RRSIG signatures on DNS records
- Traces the chain of trust from the root zone to the domain
Why It Matters
Without DNSSEC, attackers can poison DNS caches and redirect users to fraudulent sites even if they type the correct URL. DNSSEC ensures that DNS responses are authentic and have not been tampered with in transit. It is especially important for financial, government, and healthcare domains.
Understanding Your Results
A properly configured DNSSEC setup should show valid DNSKEY records, a matching DS record in the parent zone, valid RRSIG signatures, and a complete unbroken chain of trust to the root. Any broken link in this chain means DNSSEC is not providing protection.
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Run DNSSEC Checker Now →Frequently Asked Questions
What is DNSSEC and why does it matter?
DNSSEC cryptographically signs DNS records so resolvers can verify they have not been altered. Without DNSSEC, an attacker on the network can intercept DNS responses and redirect you to malicious sites even when you type a correct URL. DNSSEC prevents this class of attack.
Does DNSSEC slow down DNS?
DNSSEC adds a small overhead due to larger DNS responses and signature validation. In practice, modern resolvers cache validated responses efficiently, and the performance impact is typically under 5ms. The security benefit far outweighs this minor latency increase.
How do I enable DNSSEC for my domain?
DNSSEC requires support from both your DNS hosting provider and your domain registrar. Enable DNSSEC in your DNS provider's control panel, which generates DNSKEY records. Then add the DS record provided by your DNS host to your domain registrar's settings to complete the chain of trust.
What happens if DNSSEC validation fails?
When DNSSEC validation fails, DNSSEC-aware resolvers refuse to return the DNS response rather than return potentially compromised data. This means the domain appears unreachable to users on validating resolvers. Misconfigured DNSSEC can make a domain completely inaccessible.
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