DNS Validator
Check for missing glue records, lame delegation, invalid NS configuration, MX record issues, TXT record validation (SPF/DKIM), oversized responses, and UDP fragmentation issues. Ensure your DNS is properly configured.
Validation looks at how a domain is configured, but a clean configuration on your authoritative servers does not always match what the wider internet is currently answering. If you have just fixed a delegation or MX issue flagged here, it is worth checking how your records have propagated across public resolvers worldwide before assuming the change is live everywhere. And because email and delegation problems often hide on names you have forgotten about, running a subdomain discovery scan of your domain can surface hosts that are worth validating too.
Frequently Asked Questions
Everything you need to know about DNS validation
Still have questions?
Contact us at a14a.org and we’ll help you out.
Explore More Tools
DNS Flattener
Resolve CNAME chains and flatten DNS records to final IPs.
DNS Propagation
Check DNS propagation across 40+ global resolvers in real-time.
DNSSEC Validator
Validate DNSSEC chain of trust, DS, DNSKEY, and RRSIG records.
Subdomain Lookup
Discover subdomains using Certificate Transparency (CT) logs.